" As Nietzsche wrote, “The value of a thing sometimes lies not in what one attains with it, but in what one pays for it—what it costs us.” Perhaps you will attain your goal, and a worthy goal at that, but at what price? Apply this standard to everything, including whether to collaborate with other people or come to their aid. In the end, life is short, opportunities are few, and you have only so much energy to draw on. And in this sense time is as important a consideration as any other. Never waste valuable time, or mental peace of mind, on the affairs of others—that is too high a price to pay. Power "

― Robert Greene , The 48 Laws of Power