It's called FAITH.
When a little child learns to walk and talk, they don't need proof that they can do it before they have faith to do it. God sends us to this earth to learn to walk by faith. Are the things God asks us to do evil? NO! they are good. God sent his Son Jesus Christ here to be the example of what manner of men we ought to be. God wants us to choose in and of ourselves to be good beings. God has made himself known and has given us the definition of good and evil. But he does still require that we accept in on faith. He does give confirmation through the Holy Ghost to those who seek.
Matthew 7:7-8
7 Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
8 For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened.
James 1:5-6
5 If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.
6 But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.