Trouble

The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell

Wind

When the wind of change blows many people run for cover, others create windmills - Chinese proverb

Knowledge

It is impossible for a man to learn what he thinks he already knows - Epictetus

Suffer

We suffer more often in imagination than in reality - Seneca

Unlearning

Perfecting oneself is as much unlearning as it is learning. Edsger Dijkstra

Decision making

Easy choices, hard life. Hard choices, easy life. - Jerzy Gregorek

The thing

You have to give up the thing you want most in the world, because that's the thing that will destroy you - Bent (movie)

Each other

Out beyond ideas of wrongdoing and rightdoing, there is a field. I’ll meet you there. When the soul lies down in that grass, the world is too full to talk about. Ideas, language, even the phrase "each other" doesn’t make any sense. -Rumi

Countable and uncountable

Not everything that counts can be counted and not everything that's counted truly counts - Albert Einstein

The most beautiful experience

The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science. - Albert Einstein