O, weary hearts! O, slumbering eyes!
O, drooping souls, whose destinies
Are fraught with fear and pain,
Ye shall be loved again!
No one is so accursed by fate,
No one so utterly desolate,
But some heart, though unknown,
Responds unto his own.
Responds,—as if with unseen wings,
An angel touched its quivering strings;
And whispers, in its song,
Where hast thou stayed so long?

Longfellow

Friendship is a word the very sight of which in print makes the heart warm.

Augustine Birrell

Real friends are our greatest joy and our greatest sorrow.

Fénelon

Nature teaches beasts to know their friends.

Shakespeare