I believe that one becomes stronger emotionally by taking life less personally. If your employer criticizes your report, don't take it personally. Instead, find out what's needed and fix it. If your girlfriend laughs at your tie, don't take it personally. Find another tie or find another girlfriend.

Be able to recognize many of the major constellations and know the stories behind them

Know how to travel from your town to a nearby town without a car, either by bus or by rail.

The only real meaning in life can be found in a good man. And maybe Paris. Preferably the two together.

Be in the habit of experimenting with your clothing so that you don't get stuck for life with a self-image developed over the course of high school.

Feeling is what you get for thinking the way you do.

Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.