“Thus they are destitute of that very lovely and exquisitely natural friendship, which is an object of desire in itself and for itself, nor can they learn from themselves how valuable and powerful such a friendship is. For each man loves himself, not that he may get from himself some reward for his own affection, but because each one is of himself dear to himself. And unless this same feeling be transferred to friendship, a true friend will never be found; for a true friend is one who is, as it were, a second self.”
Section 80; translation by J. F. Stout
Laelius De Amicitia – Laelius On Friendship (44 BC)
Original
Ita pulcherrima illa et maxime naturali carent amicitia per se et propter se expetita nec ipsi sibi exemplo sunt, haec vis amicitiae et qualis et quanta sit. Ipse enim se quisque diligit, non ut aliquam a se ipse mercedem exigat caritatis suae, sed quod per se sibi quisque carus est. Quod nisi idem in amicitiam transferetur, verus amicus numquam reperietur; est enim is qui est tamquam alter idem.
Help us to complete the source, original and additional information
Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes
Phaedrus as translated in the novel, p. 104
The Charioteer (1953)

Un Art de Vivre (The Art of Living) (1939), The Art of Friendship

“True friendship is that feeling in which one loves, one has trust and spontaneous smiles are born.”
Original: La vera amicizia è quel sentimento in cui ci si vuol bene, si ha fiducia e nascono spontanei sorrisi.
Source: prevale.net

Gilbert Burnet History of His Own Time (London: William S. Orr, 1850)
“A warrior has only one true friend: himself.”
So he feeds his body well; he trains it; works on it. Where he lacks skill, he practises. Where he lacks knowledge, he studies. But above all he must believe. He must believe in the strength of will, of purpose, of heart and soul.
Source: Drenai series, Quest for Lost Heroes, Ch. 3
"Dr. Robertson Davies".
Conversations with Robertson Davies (1989)