Saxum volutum non obducitur musco.

Pietra che rotula non piglia muffa, and piedra movediza no la cubre moho, that is, a rolling stone is ever bare of moss, is used to be said to persons who are frequently changing their situation or employment; such persons being more likely to dissipate and waste, than to improve and increase their property. To the same purport is, Planta quæ sæpe transfertur non coalescit, the tree that is often moved does not thrive.