My friend the philosopher and martial artist Daniele Bolelli once gave me a helpful metaphor. He explained that training was like sweeping the floor.… - Ryan Holiday

Were you to live three thousand years, or even a countless multiple of that, keep in mind that no one ever loses a life other than the one they are living, and no one ever lives a life other than the one they are losing. The longest and the shortest life, then, amount to the same, for the present moment lasts the same for all and is all anyone possesses. No one can lose either the past or the future, for how can someone be deprived of what’s not theirs?” — MARCUS AURELIUS, MEDITATIONS, 2.14

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 combination of power, fear, and mania can be deadly. The leader, convinced that he might be betrayed, acts first and betrays others first. Afraid that he's not well liked, he works so hard to get others to like him that it has the opposite effect. Convinced of mismanagement, he micromanages and becomes the source of the mismanagement. And on and on - the things we fear or dread, we blindly inflict on ourselves.