If anything is spoken in jest, it is not fair to turn it to earnest.
The evil that we know is best.
'He means well' is useless unless he does well.
Your wealth is where your friends are
To snatch the worm from the trap.
What you lend is lost; when you ask for it back, you may find a friend made an enemy by your kindness. If you begin to press him further, you have the choice of two things - either to lose your loan or lose your friend.