But when all our Lord’s sacred discourses are full of His commandments, why does He give this special commandment respecting love, if it is not that every commandment teaches love, and all precepts are one? Love and love only is the fulfilment of every thing that is enjoined. As all the boughs of a tree proceed from one root, so all the virtues are produced from one love: nor hath the branch, i. e. the good work, any life, except it abide in the root of love.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. xxvii. in Evang.