Regret for the things we did can be tempered by time; it is regret for the things we did not do that is inconsolable.” —Sydney Harris

As James MacGregor Burns taught in his classic text, Leadership, we should never confuse brute power with leadership.

People such as James West and Jennifer Heemstra and Clarence Dennis skillfully applied the lessons they gleaned from painful setbacks as part of building successful and fulfilling lives. But we’re not hardwired to confront failure thoughtfully; we have to learn to do it.

It’s easy to take comfort in the fact that other people agree with us. As legendary investor Warren Buffett pointed out, though, “The fact that other people agree or disagree with you makes you neither right nor wrong. You will be right if your facts and reasoning are correct.”

The people executing established practices say they want new ideas, but they don’t want the bad ones. And because they so want to avoid the bad ones, they never deviate enough to find good ones.

One of the biggest mistakes that I see people make is they don’t want to learn from someone who has a character blemish or a worldview that doesn’t align with theirs. Seneca captured the right approach when he said in On the Tranquility of the Mind, “I shall never be ashamed of citing a bad author if the line is good.” Or, as Cato the Elder put it, “Be careful not to rashly refuse to learn from others.” Don’t throw away the apple because of a bruise on the skin.