A Friend (n.) is a single soul dwelling in two bodies.
A Friend (n.) is the mirror in which we see ourselves: we blame others for what we do ourselves without noticing, so as we see our face in a glass we can know ourselves only by looking at a friend.
Friend (n.) are a sentence to perpetual grief: among many, one at least is always likely to be in misfortune, if many — and love spread so far, like sight at a distance, fails.
A Friend (n.) is loved as himself, not as a musician or a doctor — the pleasure of friendship comes from him merely being who he is.
A Friend (n.) is not to be chosen like a garment: swap an old coat for a better one, but not an old friend for one you do not yet know to be better — friendship takes the proverbial bushel of salt.
A Friend (n.) is the way we perceive ourselves enjoying the good — even common pleasures shared with him are sweet, because perceiving him is perceiving oneself.
A Friend (n.) is another self: loving him, spending time with him and wanting his good are modelled on how one treats oneself.