Humility
Humility is slowly disappearing and is seen as weakness: in a society where "the law of the strongest" prevails, being humble isn't seen as a sign of intelligence but rather as weakness because one doesn't shout out one's reasons.
Humility should permeate all our actions, both in "thinking" and "acting."
We should rediscover our humility, starting first with listening, which is the path that leads to humility.