On friendship
Not alone
We do not so much need the help of our friends as the confidence of their help in need.
In the face of a true friend a man sees as it were a second self.
Sources
Epicurus · Vatican Sayings 34
Wording as reproduced by Epicurus.info; the translator of this wording has not been confirmed. The Vatican Sayings are a collection of Epicurean maxims.
Cicero · On Friendship 7
E. S. Shuckburgh translation.