“Wealth gained by dishonesty (vanity) will be diminished, but he who labors will increase.” Proverbs 13:11
You can exert maximum effort and energy to make a living (or accomplish a goal) however the outcome can easily become diminished or end up less than the desired result.

This occurs when you are functioning without the strength and guidance of God and relying on self sufficiency. To be successful you have to commit your works to God and operate with pure motives. You seek out God for wisdom and direction and walk with Him by faith.
Noah could not have built the ark without the strength and wisdom of God. He was operating in the will of God and was successful because God was His partner.
Gideon did not defeat the Midianites with a strong army. His army was only three hundred men and they were greatly outnumbered by the enemy. God was his victor!
Joshua was successful in leading the Israelites to the Promised Land and defeating their enemies because God was with him and went before him.
You have to be living in the flow of God to be successful. He is the tree of life and His works endure forever.
Thought for the day:

“I am the God of the harvest! I determine the outcome of your efforts and without Me you can do nothing. My success comes to those who labor under My authority and live out My values. Nothing is impossible for Me!”