We have a tendency to push against things we can’t change while neglecting the things we can. Wisdom comes in knowing which attitude to apply in any given situation. Always start with good will; make this your default setting. Strive to maintain that attitude. Take joy in other people’s happiness. More importantly, learn to take joy in your own happiness, in the fact that you’re progressing. Our attitudes in response to situations is what we can change. Aging, illness and death are inevitable; they cannot be changed, but whether or not we are going to suffer because of these things can be. We take our state of mind for granted, but it’s something that can be changed.