In no particular order:
That opinion of other people affects us.
That there is an ingrained ego in us.
That we are the by-products of the society we are born or bred in.
That most but not all friendship/love is conditional.
That we can’t be unbiased.
That we don’t want to leave our comfort zones.
That we like to stay in the past.
That we want to listen only to the convenient truths.
That time and again, we have been cheated, made fool of, fu**ed by smarter/heartless people.
That most of our dreams are still dreams because we didn’t give it all we had.
That we could not have had any better life than what we are having.
And being humans, we can’t do anything about it.
Just try to get better.