"money doesn’t grow on trees" said to warn someone to be careful how much money they spend, because there is only a limited amount --dictionary.cambridge.org
"use it or lose it" if you don't continue to practice or use an ability, you might lose that ability --Collins Dictionary
"good things come in threes" if a fortunate event has already occurred twice, a third fortunate event is likely to occur --request
"damned if you do, damned if you don't" Level the statement is subjectively true and experiential. Happens to be the level of politicians.
lay all one's cards on the table to be honest with other people and to tell them one's thoughts, plans, etc., in a very open way --request