Our way of life in this world resembles a document that is still in draft form: things can be added or taken out, and alterations can be made, whenever one wants. But life in the world to come resembles the case of completed documents that have the king’s seal already upon them, and no addition or subtraction can be made. While we are still here, where changes can be made, let us take a look at ourselves, and while we still have control over the book of our life, and it is in our hands, let us be eager to add to it by means of a good lifestyle, and delete from it the defects of our former lifestyle.
-St Isaac the Syrian
Prayerful Life 