If you only obey God’s word when it seems reasonable or profitable to you – well, that isn’t really obedience at all. Obedience means you cede someone an authority over you that is there even when you don’t agree with him. God’s law is for times of temptation, when ‘body and soul rise in mutiny against their rigour.’ – Tim Keller
Obedience is never easy. That is why you need the grace of God. Trust His Sovereignty and wisdom.