“Their friendship was at an end, it seemed to him. The evil time when he had lived on Ravelston had spoiled everything. Charity kills friendship.”

“Friendship's best,' I said, 'and friendship's forever because no baby can come along to spoil it.”

“Sharpe had been turbulent, ambitious, but one day, Hogan supposed, that restlessness would have found satisfaction. Then, curiously, Hogan found himself resenting Sharpe, resenting him because he had been killed and was thus denying his friendship to those who still lived.”

“There it was, there it is, the place where during the best time of our lives friendship had its home and happiness its headquarters.”

“Adam had turned down so many offers for help from Gansey. Money for school, money for food, money for rent. Pity and charity, Adam had thought. For so long, he'd wanted Gansey to see him as an equal, but it was possible that all this time, the only person who needed to see that was Adam.
Now he could see that it wasn't charity Gansey was offering. It was just truth.
And something else: friendship of the unshakable kind. Friendships you could swear on. That could be busted nearly to breaking and come stronger than before.”

“In Aryans' Discipline, to build a friendship is to build wealth, to maintain a friendship is to maintain wealth and to end a friendship is to end wealth.”

“Friendship often ends in love; but love in friendship—never.”

“Friendship often ends in love, but love in friendship - never.”

“Charity, by which God and neighbor are loved, is the most perfect friendship.”

“Their friendship was only one aspect of their lives but it seemed to give meaning to all the others.”