Xenophon: Hiero or Tyrannicus

"Now consider friendship in its turn, and how the tyrants partake of it. First let us reflect whether friendship is a great good for human beings.

For surely it is the case with a man who is loved by someone that the one who loves him gladly sees him present; gladly benefits him; longs for him if he is absent; welcomes him returning again; takes pleasure with him in the goods which are his; and comes to his aid if he sees him fallen into any trouble.