Not to do any evil, to cultivate good, to purify one's mind, this is the Teaching of the Buddhas. 諸惡莫作，眾善奉行；自淨其意，是諸佛教
We know many things happening in this world, but we don't know what is happening in our mind.
Ven. K. Sri. Dhammananda, Dhamma Tak: How to live without fear and worry