Basil of Caesarea — as excerpted in the Catena Aurea on Luke 14:28-33

“(in Esai. 2.) Or the tower is a lofty watch-tower fitted for the guardianship of the city and the discovery of the enemy’s approach. In like manner was our understanding given us to preserve the good, to guard against the evil. For the building up whereof the Lord bids us sit down and count our means if we have sufficient to finish.”