A rolling stone gathers no moss. Attributed to the Syrian writer Publilius Syrus (85-43 BC), this old proverb was intended to criticize nomadism and the attitude of those who refuse to root their activity in a particular place and become part of an established community.

Be quick for a purpose.

I interpret it as someone who is always bouncing around moving to the latest thing rather than slowing down and focusing on one thing, taking the time to build something of value. It could apply to a relationship, family, business, education, etc.