Leonardo da Vinci·1500Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.
Ovid·2 CE ADTake rest; a field that has rested yields a bountiful crop.
Henri Poincaré·1908These sudden inspirations never happen except after some days of voluntary effort which has appeared absolutely fruitless. The role of this unconscious work in mathematical invention appears to me incontestable. Rest gives back to the mind its force and freshness.
