“I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing.” – John 15:5
Similar to wisdom, growth in the Christian life must be built into us by somebody else. (A very specific somebody else.) If a man would see the fruit of Christlikeness in his life, he should remember these words of Christ Himself. To be in any way effective for the cause of the Kingdom or to become in any way more like Jesus, we must remember that our own efforts will profit us nothing in either regard. We must recognize, as Paul did, that though our work is necessary and important, it is God who gives the increase (I Corinthians 3:6-8).