When the intellect scorns the teaching which purifies it from the passions, and ceases to examine what should be done and what should not be done, it will through ignorance inevitably be overcome by the passions. As the intellect gradually comes to be separated from God, it is more and more involved in difficulties not of its own choosing. Obeying the demons, it makes a god of the belly and tries to find relief there from what oppresses it. Let Saul convince you of the truth of this: because he did not take Samuel for an advisor in all things he inevitably turned to idolatry, putting his trust in a ventriloquist and consulting her as if she were a god (1 Samuel 28: 7-20).
He who asks to receive his daily bread (Matthew 6:11) does not automatically receive it in its fullness as it is in itself: he receives it according to his own capacity as recipient. The Bread of Life (John 6:35) gives Himself in His love to all who ask, but not in the same way to all; for He gives Himself more fully to those who have performed great acts of righteousness, and in smaller measure to those who have not achieved so much. He gives Himself to each person according to that person’s spiritual ability to receive Him.
~St Maximos the Confessor