Joshua 23:14

Behold, this day I am going the way of all the earth.  And you know in all your hearts and in all your souls that not one thing has failed of all the good things which the Lord your God spoke concerning you.  All have come to pass for you; not one word of them has failed. 

God created the earth and all that is within it with the word.  He speaks His word to us through the bible with prophecy, the covenant, and through the example of Jesus.  Man, and the world may fail, but God will never fail.  His word works for us night and day.  Our job is to have faith and believe in the promises of God.