“Change is the master key. A man can wear out a particular part of his mind by continually using it and tiring it, just in the same way as he can wear out the elcbows of his coat…[O]ne cannot mend the frayed elbows of a coat by rubbing the sleeves or shoulders; but the tired parts of the mind can be rested and strengthened not merely by rest, but by using other parts…

To be really happy and really safe, one ought to have at least two or three hobbies, and they must all be real.” – Winston Churchill, “Hobbies”, Pall Mall, 1925