An incompetent person in a responsible position may cause huge damage. Such a person should act less and think more.

Superficial knowledge is potentially more dangerous than ignorance. It gives a false sense of security encouraging an ignorant man to persevere in his efforts that can result in huge damage.

Don't think you can act perfectly. A perfect person doesn't exist. Always strive to give your best effort, and that's it.

There is a huge difference between thinking we know something and actually knowing something.

A person with a big ego usually knows very little.

Ideas tell a lot about a person who generated them.