@CryptoPoseidonn It cannot be 100% because it's, as you say, a "belief". But if you observe everything around you you will notice that things are not random, that there is a scheme, a sort of a law that governs it all. It's not someone, but some kind of power that's out there IMO.
@CryptoPoseidonn If you are sad, just meditate and focus on breathing. When the mind is quiet and calm, there is no sadness. All other states of mind are just noise.