10 lessons by the age of 20

1. Every person is a complex thread, that we can't ever fully unravel without getting stuck in it as well. 
2. The future doesn't exist, the past not anymore. There is only the uniqueness of the sensation known as "now", that goes by. At some time you will wonder where the that moment went, while you were planning the future. 
3. We can't make people ours, only participate in each others lives. 
4 . A degree is no garantuee for intellectualism. Nor is the absence of one a denial of intellectualism. 
5. Experience is always more concrete and therefore more profound than the theory. 
6. Everything is and can be described as it is.  Nothing more. The rest is mere perspective. 
7. You're less rational than you think. Adjusting rationality to emotions is common and only shows your inner desires.
8. Freedom is also the presence of the other person. 
9. Having an ego can only cause misery. 
10. Acceptance of an unchangeable situation and then adjustment is always better than forcing adjustment upon the situation.