According to Bishop Theophan," two wills existing in us fight against one another: one belongs to the intelligent part of our soul and is therefore called the intelligent will, which is the higher; the other belongs to the sensory part and is therefore called the sensory will, which is the lower. The latter is more frequently called the dumb, carnal, passionate will. The higher will is always desiring nothing but good, the lower—nothing but evil. Each equally happens by itself, so that neither is a good desire in itself reckoned as good, nor an evil desire as evil. The reckoning depends upon the inclination of our own free will. Therefore, when our will inclines towards a good desire, it is reckoned in our favour; but when we incline towards an evil desire, it is reckoned against us. These desires follow one upon another: when a good desire comes, an evil desire immediately opposes it; and when an evil desire comes, a good desire at once rises against it.. Our will is free to follow the one and the other, and whatever desire our will inclines towards, it becomes victorious on this particular occasion. It is in this that all our unseen spiritual warfare consists. Its aim should be never to let our free will incline towards the desire of the lower, carnal and passionate will, but always to follow only the intelligent, higher will. For it is the will of God, to follow which is the basic law of our being: ‘ Fear God, and keep his commandments: for this is the whole duty of man “ says the Preacher (Ecclesiastes xii. 13). Each of these desires draws our will towards itself and wishes to subjugate it. Stifle the lower desire and incline towards the higher—and victory is yours; but disregard the higher and choose the lower, and you will find yourself vanquished. St. Paul writes of this: “I find then a law, that, when I would do good, evil is present with me. For I delight in the law of God after the inward man: but I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members’ (Rom. vii. 21-53). And he gives to all the rule: ‘Walk in the Spirit, and ye shall not fulfill the lust. of the flesh’ (Gal. v. 16). And this cannot be accomplished without struggling with the flesh.
A particularly great effort and laborious toil must be experienced to start with by those who, before deciding to change their worldly and carnal life to a righteous one and to give themselves up to the practices of love and sincere service of God, had enmeshed themselves in evil habits through frequent satisfaction of the desires of their carnal and passionate will. Although the demands of their intelligent will, which they wish to follow, stand on one side of their free will and arc made active by God, yet on the other side there stand the desires of the carnal and passionate will, towards which they still feel a certain sympathy. Opposing the former, these desires pull it towards their side with the same force as a beast of burden is pulled by its halter; and only the grace of God gives them strength to remain firm in the decision they have taken. .Long-drawn resistance and not yielding them victory saps, the strength of carnal desires; yet this does not end the struggle."