Besser ein Spatz in der Hand, als eine Taube auf dem Dach (A sparrow in the hand is better than a pigeon on the roof) or (A bird in the hand is worth two in the bush).
One of the easiest things to do is to criticize and judge other people who do things we don’t want to identify with. A famous writer said that, any time you judge somebody, you rather define yourself and not the person you are judging.
Have some knowledge in natural sciences! As lights of the world, we need to have some knowledge in natural sciences in order to dominate the universe well.