Friendship, like credit, is ...

Friendship, like credit, is highest when it is not used.
Friendship, like credit, is highest when it is not used.

Quotes from the same author

Never explain - your friends do not need it and your enemies will not believe you anyway.
A little more persistence, a little more effort, and what seemed hopeless failure may turn to glorious success.
There is no failure except in no longer trying.
A failure is a man who has blundered but is not capable of cashing in on the experience.
The final proof of greatness lies in being able to endure criticism without resentment.