Saint Nikodemos the Hagiorite
An excerpt from "Unseen Warfare"by Saint Nicodemus of the Holy Mountain, and Saint Theophan the Recluse
In addition to training your mind to learn, you should also control your will, so as not to let it lean towards your own desires, but instead to lead it to be perfectly as one with the will of God. Moreover keep it firmly planted in your mind, that it is not enough for you merely to desire and seek to please God.
Always and in everything; you must desire it as if moved by God Himself, and for one single aim—to please Him with a pure heart.
To be firmly grounded in this aim, we have to endure a much greater struggle with our nature than in anything we have mentioned above. For our nature is so accustomed to please itself, that it seeks its own comfort and pleasure in all its doings, even the most righteous and spiritual, and secretly and lustfully feeds on it as though it were food.
And so it happens that when we see the chance of spiritual doing lying before us, we immediately desire it and impetuously rush towards it;yet not as men moved by the will of God, nor for the sole purpose of pleasing Him, but for the sake of the comfort and joy which is born in us, when we desire and seek that which God wants from us. This prelest is the better concealed and hidden, the higher and more spiritual is the nature of what we desire. This is why I say that we should not be satisfied with desiring what God wills, but must desire it how He wishes it, when He wishes it and for the reason and purpose He wishes it.
The Apostle also teaches us to prove what is the will of God, that it is not only good, but also acceptable to Him and perfect in all respects. He says: ‘Be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God’ (Rom. xii. 2). For if our action is faulty, even in one respect, or if we do something not with our whole will and strength, it is clear that it is, and is called, imperfect. This should lead you to the conclusion that even when we desire God Himself and seek Him, even this desire and search can contain some fault or omission, and may be mixed with some pandering to our self-love or vainglory; since we may have in view more our own good than the will of God, and do something rather for our own sake than for the sake of God. Yet He considers only those actions acceptable, which are done solely for His glory and wishes us to love Him alone, desire Him alone and work for Him alone.
Thus, my brother, if you wish to safeguard yourself from such hidden obstacles on the path to perfection, if you wish to be firmly grounded in such an attitude as to desire and do all things only because God wishes it, desirous only to please and glorify Him and to work for Him alone, since He wishes to be the beginning and the end in every action and every thought of ours— act in the following manner.