Friendship is the medicine ...

Friendship is the medicine for all misfortune; but ingratitude dries up the fountain of all goodness.
 Cardinal Richelieu

Quotes from the same author

Not the least of the qualities that go into the making of a great ruler is the ability of letting others serve him.
 Cardinal Richelieu
When people are too comfortable, it is not possible to restrain them within the bounds of their duty? They may be compared to mules who, being accustomed to burdens, are spoilt by rest rather than labour.
 Cardinal Richelieu
If God forbade drinking, would He have made wine so good?
 Cardinal Richelieu