Use It Or Lose It Quotes by Hippocrates, R. Buckminster Fuller, Susan Sontag, Richard Bach, Ralph Waldo Emerson, Theodore Roosevelt and many others.

That which is used – develops. That which is not used wastes away.
Don’t fight forces, use them.
What we need is to use what we have.
Perspective – Use It or Lose It. If you turned to this page, you’re forgetting that what is going on around you is not reality. Think about that.
We have more than we use.
It is not what we have that will make us a great nation; it is the way in which we use it.
The only use of knowledge of the past is to equip us for the present.
Money is like an arm or leg – use it or lose it.
With no gravitational force to work against, your body not only doesn’t need the same amount of muscle and bone, it starts breaking them down. As on Earth, so in space: use it or lose it. And exercise may not solve the problem.
Who makes quick use of the moment is a genius of prudence.
Time-Use it or lose it. Time, like a snowflake, disappears while we’re trying to decide what to do with it. The surest way to be late is to have plenty of time.
Ranger declined the butterscotch pudding, not wanting to disrupt the consistency of his blood sugar level. I had two puddings and coffee, choosing to keep my pancreas at peak performance. Use it or lose it is my philosophy.
Yes, in my life, since we must call it so, there were three things, the inability to speak, the inability to be silent, and solitude, that’s what I’ve had to make the best of.
Because it is a ‘use it or lose it’ brain, when we develop a map area [in the brain], we long to keep it activated. Just as our muscles become impatient for exercise if we’ve been sitting all day.
Build a system that even a fool can use, and only a fool will want to use it.
If you want to retire happy, great health is important. The foundation for all happiness lies in health. Physical, mental, or spiritual health – you must use it or lose it!
Perspective – Use It or Lose It.