Don't have faith in your good works

There is always a danger that when we begin to see fruit in our lives, we’ll subtly begin to rely on that fruit for our salvation, instead of on Christ. Guard against that temptation, Christian. Realize that the fruit you bear is merely that — the fruit of a tree already made good by God’s grace in Christ. To rely on your own Christian fruit to secure God’s favor is ultimately to shift your faith from Jesus to yourself. And that is no salvation at all.

Greg Gilbert from What is the Gospel?