No matter how much pressure you feel at work, if you could find ways to relax for at least five minutes every hour, you'd be more productive.
This art of resting the mind and the power of dismissing from it all care and worry is probably one of the secrets of energy in our great men.
If a man insisted always on being serious, and never allowed himself a bit of fun and relaxation, he would go mad or become unstable without knowing it.
During [these] periods of relaxation after concentrated intellectual activity, the intuitive mind seems to take over and can produce the sudden clarifying insights which give so much joy and delight.
To be able to fill leisure intelligently is the last product of civilization, and at present very few people have reached this level.