Each time I am faced with a new demand from the Lord, I look to Him to do in me what He requires of me. It is not a case of trying, but of trusting; not of struggling, but of resting in Him. If I have a hasty temper, impure thoughts, a quick tongue or a critical spirit, I shall not set out with a determined effort to change myself, but, reckoning myself dead in Christ to these things, I shall look to the Spirit of God to produce in me the needed purity or humility or meekness. This is what it means to "stand still, and see the salvation of the Lord, which he will work for you" (Exodus 14:13). -- Watchman Nee

I agree with Watchman on the above, except to say that the needed purity, humility, or meekness is already in the Christian. These traits are simply accessed by faith by the Christian, as Holy Spirit reveals to the Christian the reality of the existence of that fruit in them by way of life in Christ.