Basil the Great
Catena Aurea · Lukasevangelium 14
For which of you, intending to build a tower, sitteth not down first, and counteth the cost, whether he have sufficient to finish it? Lest haply, after he hath laid the foundation, and is not able to finish it, all that behold it begin to mock him, Saying, This man began to build, and was not able to finish. Or what king, going to make war against another king, sitteth not down first, and consulteth whether he be able with ten thousand to meet him that cometh against him with twenty thousand? Or else, while the other is yet a great way off, he sendeth an ambassage, and desireth conditions of peace. So likewise, whosoever he be of you that for-saketh not all that he hath, he cannot be my disciple.
But our Lord’s intention in the above-mentioned example is not indeed to afford occasion or give liberty to any one to become His disciple or not, as indeed it is lawful not to begin a foundation, or not to treat of peace, but to shew the impossibility of pleasing God, amidst those things which distract the soul, and in which it is in danger of becoming an easy prey to the snares and wiles of the devil.