"What ever truth drops on it eventually grinds to a powder"

This quote by Art Blakey is a pointer that reality is powerful and will ultimately dominate. No matter how difficult somebody might attempt to hide the fact, it will become revealed. The truth resembles a rock that is dropped onto a difficult surface area. In time, the rock will be ground down into a fine powder. This is a metaphor for how the truth will become revealed, no matter how tough somebody might attempt to keep it hidden. It is a pointer that the reality will always come out in the end, which it is necessary to be honest and genuine in all aspects of life.