Because GOD believes in us, HE expects us to spread the Gospel/Good News about JESUS to the unreached world, where people are still in spiritual darkness and bondage! GOD can use HIS angels to do it in a day, but because HE trusts us, HE left it to us...You know there are ranks in Heaven? Rewards in Eternity? Work for GOD now, so that someday you can have an Everlasting Awesome Retirement in HEAVEN!!! Wisdom....