"Do not become annoyed when faced with difficulties. To do so merely adds difficulty to difficulty and further disturbs your mind. By maintaining a mind of peace and nonopposition, difficulties will naturally fall away.
Master Sheng-yen"
"The simplest spiritual discipline is some degree of solitude and silence. But it’s the hardest, because none of us want to be with someone we don’t love.
-Richard Rohr"
Counterfactual Reasoning: considering the consequences of deciding to do x OR not to do x. Mostly applicable to the modern utilitarian but interesting nonetheless.