Our Lord's making of a disciple is supernatural. He does not build on any natural capacity of ours at all. God does not ask us to do the things that are naturally easy for us- He only asks us to do the things that we are perfectly fit to do through His grace, and that is where the cross we must bear will always come.

The Golden Book of Oswald Chambers: My Utmost for His Highest; Selections for the Year (ed. 1935)