Aelred of Rievaulx, Spiritual Friendship (1.20-26):
AELRED: It is proper for my friend to be the guardian of mutual love or of my very soul, that he may in loyal silence protect all the secrets of my spirit and may bear and endure according to his ability anything wicked he sees in my soul. For the friend will rejoice with my soul rejoicing, grieve with it grieving, and feel that everything that belongs to a friend belongs to himself…
IVO: Since there is so much perfection in true friendship, no wonder those whom the ancients praised as true friends were so few. From so many centuries past, as Cicero says, legend extols only three or four pairs of friends! But if in our own Christian times friends are so few, I seem to be slaving in vain to acquire this virtue, for I am terrified now by its astonishing height, and I almost despair of reaching it.
AELRED: As a wise man once said, “for great achievements, the effort is great in itself.”