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We need to work to keep from getting rusty.

I'd much rather wear out than rust out.

You'll have time to rest when you're dead.

It is better to rust out than wear out.

Idleness is to the human mind like rust to iron.

I were better to be eaten to death with a rust than to be scoured to nothing with perpetual motion.

When you turn 60, the key is to not stop moving. Once you start to stop moving, you rust. You got to just keep going.

What is without periods of rest will not endure.

A sword, a spade, and a thought should never be allowed to rust.

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.