So either a rolling stone doesn’t get crap stuck to it because it’s moving too fast [most common modern use]

*or*

It moves too fast for things of value to have time to develop.

Well, after about twenty years or so, the son finally decided he would write a book about his life’s experiences, and described all the different ways he knew one could make a living, and all the places he had lived. The book was an immediate hit, and he became fabulously wealthy and famous. When he returned home to see his father again, his father immediately greeted him with “Ah, my son! How true it is that the ramblin’ bee gathers the honey!”