Men of genius sometimes ...

Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.
Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.

Quotes from the same author

All our knowledge has its origins in our perceptions.
It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things.
Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
Nothing strengthens authority so much as silence.
He who is fixed to a star does not change his mind.