We can waste so much time and energy when we spend our lives resisting what is. Our constant mental activity is a great example. Whether it is filled with positive or negative thoughts our “mental activity is as natural as a hot bubbling spring” (from Wisdom of the Peaceful Warrior by Dan McMillan).
As this author says we have more control over what we do than over what we think and feel, so use your energy wisely by focusing on your actions and letting the rest be.