One act of kindness should be paid back by another act of kindness.

Used to express regret for a foolish impromptu or impulsive past action.

(music, mnemonic) A mnemonic phrase to help remember the order of the five lines on a musical treble stave in order from the bottom to the top: E G B D F.

Debased coinage (with low levels of precious metals) replaces purer coinage (with higher levels of precious metals).

Well-intended acts can potentially lead to disasters.

(colloquial) To leave at an opportune time or before adverse conditions arise.

Nothing good lasts forever.

beneficial actions often go unappreciated or are met with outright hostility.

One should not expect a reward for good deeds, but should perform them merely for the satisfaction of doing so.

(idiomatic) To waste money in a fruitless attempt to recoup losses previously incurred.