“The mind must be given relaxation—it will rise improved and sharper after a good break. Just as rich fields must not be forced—for they will quickly lose their fertility if never given a break—so constant work on the anvil will fracture the force of the mind. But it regains its powers if it is set free and relaxed for a while. Constant work gives rise to a certain kind of dullness and feebleness in the rational soul.”

Seneca, On Tranquility Of Mind, The Daily Stoic (Page 381)