Those who live only to satisfy their own sinful nature will harvest decay and death from that sinful nature. But those who live to please the Spirit will harvest everlasting life from the Spirit.
The one who sows in his flesh will reap a harvest of corruption, but the one who sows in the Spirit will reap from the Spirit the reward of eternal life.
And it is impossible to please God without faith. Anyone who wants to come to him must believe that God exists and that he rewards those who sincerely seek him.