There are several signs that the energy of the Holy Spirit is beginning to be active in those who genuinely aspire for this to happen and are not just putting God to the test–for, according to the Wisdom of Solomon, “It is found by those who do not put it to the test, and manifests itself to those who do not distrust it” (cf. Wisdom 1:2). In some it appears as awe arising in the heart, in others as a tremulous sense of jubilation, in others as joy, in others as joy mingled with awe, or as a tremulousness mingled with joy, and sometimes it manifests itself as tears and awe.
For the soul is joyous at God’s visitation and mercy, but at the same time is in awe and trepidation at His presence because it is guilty of so many sins.
~St Gregory of Sinai (Philokalia, vol.4, pp.259-260)
You need great discrimination in order to distinguish between good and evil. So do not readily or lightly put your trust in appearances, but weigh things well, and after testing everything carefully cleave to what is good and reject what is evil (cf. 1 Thessalonians 5:21-22). You must test and discriminate before you give credence to anything. You must also be aware that the effects of grace are self-evident, and that even if the devil does transform himself he cannot produce these effects: he cannot induce you to be gentle, or forbearing, or humble, or joyful, or serene, or stable in your thoughts; he cannot make you hate what is worldly, or cut off sensual indulgence and the working of the passions, as grace does. He produces vanity, haughtiness, cowardice and every kind of evil. Thus you can tell from its effects whether the light shining in your soul is from God or from satan. The lettuce is similar in appearance to the endive, and vinegar to wine; but when you taste them the palate discerns and recognizes the differences between each. In the same way the soul, if it possesses the power of discrimination, can distinguish with its noetic sense between the gifts of the Holy Spirit and the illusions of satan.
~St Gregory of Sinai (Philokalia, vol.4, p.286)
…if you are rightly cultivating stillness and aspiring to be with God, and you see something either sensory or noetic, within or without, be it even an image of Christ or of an angel or of some saint, or you imagine you see a light in your intellect and give it a specific form, you should never entertain it. For the intellect itself naturally possesses an imaginative power and in those who do not keep a strict watch over it it can easily produce, to its own hurt, whatever forms and images it wants to. In this way the recollection of things good or evil can suddenly imprint images on the intellect’s perceptive faculty and so induce it to entertain fantasies, thus making whoever this happens to a daydreamer rather than a hesychast.
~St Gregory of Sinai (Philokalia, vol.4, p.283)
The energy of grace is the power of spiritual fire that fills the heart with joy and gladness, stabilizes, warms and purifies the soul, temporarily stills our provocative thoughts, and for a time suspends the body’s impulsions. The signs and fruits that testify to its authenticity are tears, contrition, humility, self-control, silence, patience, self-effacement and similar qualities, all of which constitute undeniable evidence of its presence.
~St Gregory of Sinai (Philokalia, vol.4, p.262)
In the case of a beginner in the art of spiritual warfare, God alone can expel thoughts, for it is only those strong in such warfare who are in a position to wrestle with them and banish them. Yet even they do not achieve this by themselves, but they fight against them with God’s assistance, clothed in the armor of His grace. So when thoughts invade you, in place of weapons call on the Lord Jesus frequently and persistently and then they will retreat; for they cannot bear the warmth produced in the heart by prayer and they flee as if scorched by fire.
St John Klimakos tells us, “Lash your enemies with the name of Jesus”, because God is a fire that cauterizes wickedness (cf. Deuteronomy 4:24; Hebrews 12:29). The Lord is prompt to help, and will speedily come to the defense of those who wholeheartedly call on Him day and night (cf. Luke 18:7).
But if prayer is not yet activated in you, you can put these thoughts to flight in another manner, by imitating Moses (cf. Exodus 17:11-12): rise up, lift hands and eyes to heaven, and God will rout them. Then sit down again and begin to pray resolutely. This is what you should do if you have not yet acquired the power of prayer. Yet even if prayer is activated in you and you are attacked by the more obdurate and grievous of the bodily passions–namely, listlessness and lust–you should sometimes rise up and lift your hands for help against them. But you should do this only seldom, and then sit down again, for there is a danger of the enemy deluding you by showing you some illusory form of truth. For only in those who are pure and perfect does God keep the intellect steadfast and intact wherever it is, whether above or below, or in the heart.
~St Gregory of Sinai (Philokalia, vol.4, pp.277-278)
No one can master the intellect unless he himself is mastered by the Spirit. For the intellect is uncontrollable, not because it is by nature ever-active, but because through our continual remissness it has been given over to distraction and has become used to that. When we violated the commandments of Him who in baptism regenerates us we separated ourselves from God and lost our conscious awareness of Him and our union with Him. Sundered from that union and estranged from God, the intellect is led captive everywhere; and it cannot regain its stability unless it submits to God and is stilled by Him, joyfully uniting with Him through unceasing and diligent prayer and through noetically confessing all our lapses to Him each day.
God immediately forgives everything to those who ask forgiveness in a spirit of humility and contrition and who ceaselessly invoke His holy name. As the Psalmist says, “Confess to the Lord and call upon His holy name” (cf. Psalm 105:1).
Holding the breath also helps to stabilize the intellect, but only temporarily, for after a little it lapses into distraction again. But when prayer is activated, then it really does keep the intellect in its presence, and it gladdens it and frees it from captivity. But it may sometimes happen that the intellect, rooted in the heart, is praying, yet the mind wanders and gives its attention to other things; for the mind is brought under control only in those who have been made perfect by the Holy Spirit and who have attained a state of total concentration upon Christ Jesus.
~St Gregory of Sinai (Philokalia, vol.4, pp.276-277)
…Constant fasting withers lust and begets patient endurance, endurance courage, courage stillness, stillness prayer, prayer silence, silence inward grief, and grief begets humility. Or, going in the reverse order, you will find how daughters give birth to mothers–how, that is to say, humility begets inward grief, and so on. In the realm of the virtues there is nothing more important than this form of mutual generation. The things opposite to these virtues are obvious to all.
St Gregory of Sinai (Philokalia, vol.4, p.272)