it's all grist to the mill
The phrase "it's all grist to the mill" means that everything, even seemingly insignificant or unrelated things, contributes or can be useful in some way towards a particular goal or purpose. It implies that nothing should be wasted or disregarded, as everything can have value or be utilized for some purpose.
Enjoy word games? Many English phrases are difficult to understand. This fun new word game challenges you to solve puzzles about English phrases. When you solve a puzzle you earn points and can see the definition and origin of the phrase.
The more you play the more you learn!