The other day I listened to a chainsaw scream and watched as a landscape worker struggled to force the saw through the wood. The problem was that the chain was not sharpened correctly. In order not to bore you with the details there are two ways that a chainsaw needs sharpening. The first is the teeth must be razor sharp to cut. The second is to have the correct depth for cutting. An operator of an incorrectly sharpened chainsaw can force it through a cut but it will take longer and perhaps even break the saw. Likewise, faith that is done in our own strength is like trying to operate a chainsaw that is sharpened incorrectly or using a dull knife. It just does not cut. When we do not trust in the power and exactness of God we try to force the results of life in our own strength. Our lives and history are littered with examples of times when God was not trusted in faith. On the other hand, Hebrews 11 gives us a list of positive examples of faith. Let us, in faith, trust God and not our own strength.
For more see HEBREWS