We still have slept together,
Rose at an instant, learn'd, play'd, eat together:
And wheresoe'er we went like Juno's swans,
Still we went coupled, and inseparable.

Shakespeare

Hold faithfulness and sincerity as first principles; have no friends not equal to yourself.

Confucius

Old friends are best. King James used to call for his old shoes. They were easiest for his feet.

John Selden

Men have sometimes exchanged names with their friends, as if they would signify that in their friend each loved his own soul.

Emerson

A generous friendship no cold medium knows,
Burns with one love, with one resentment glows,
One should our interests and our passions be,
My friend must hate the man that injures me.