On the "good" works of the flesh
Self-confidence and self-reliance, as we have said, are the notable traits of the good works of the flesh. It is impossible for the flesh to lean upon God. It is too impatient to tolerate any delay. So long as it deems itself strong it will never depend upon God. Even in a time of desperation the flesh continues to scheme and to search for a loophole. It never has the sense of utter dependency. This alone can be a test whereby a believer may know whether or not a work is of the flesh. Whatever does not issue from waiting upon God, from depending upon the Holy Spirit, is unquestionably of the flesh. Whatever one decides according to his pleasure in lieu of seeking the will of God emanates from the flesh. Whenever a heart of utter trust is lacking, there is the labor of the flesh. Now the things done may not be evil or improper; they in fact may be good and godly (such as reading the Bible, praying, worshiping, preaching); but if they are not undertaken in a spirit of complete reliance upon the Holy Spirit, then the flesh is the source of all. The old creation is willing to do anything-even to submit to God-if only it is permitted to live and to be active! However good the deed of the flesh may appear to be, "I", whether veiled or seen, always looms large on the horizon. The flesh never acknowledges its weakness nor admits to its uselessness; even should it become a laughingstock, the flesh remains unshaken in the belief in its ability.
"Having begun with the Spirit, are you now ending with the flesh?" This uncovers a great truth. One may begin well, in the Spirit, but not continue well therein. Our experience bears out the fact of the relative ease with which a thing may begin in the Spirit but end up in the flesh. Often a newly apprehended truth is imparted by the Holy Spirit; after awhile, however, this truth has turned into a boasting of the flesh. The Jews in the early days committed just such an error. How frequently in the matters of obeying the Lord, of denying one's self afresh, of receiving power to save souls, one genuinely may rely upon the Holy Spirit at the outset; yet not long afterwards that same person changes God's grace into his own glory, treating what is of God as his possession. The same principle holds true in our conduct. Through the working of the Holy Spirit at the beginning there occurs a mighty transformation in one's life whereby he loves what he previously hated and hates what he loved before. Gradually, though, "self" begins to creep in unawares. The person increasingly interprets these changes to be of his making and unto his own admiration; or he grows careless and gradually pushes on by self-trust rather than by dependence upon the Holy Spirit. Thousands of matters there are in the experiences of believers that begin well in the Spirit but terminate unfortunately in the flesh.
Why is it that many of God's dear children eagerly seek a wholly consecrated walk and most earnestly desire the more abundant life but nevertheless fail? Often when listening to messages, conversing with people, reading spiritual books, or praying privately, the Lord makes known to them how perfectly possible it is to have a life of fullness in the Lord. They are made to sense the simplicity and sweetness of such a life and they see no obstacle in the way to their securing it. Indeed they experience a blessing with power and glory which they have never before known. Oh, how good it is! But alas, how soon it all vanishes. Why? How? Is it because their faith is imperfect? Or their consecration not absolute? Surely their faith and consecration have been utter towards the Lord. Then why such a failure? What is the, reason for losing the experience and how can it be restored? The answer is simple and definite. They are trusting in the flesh and trying to make perfect by the flesh what was begun in the Spirit. They are substituting self for the Spirit. Self desires to lead the way while hoping that the Holy Spirit will come alongside and assist. The position and work of the Spirit have been replaced by that of the flesh. Absent is that complete reliance upon the Spirit's leading for accomplishment. Absent also is a necessary waiting upon the Lord. Attempting to follow Him without denying the self is the root of all failures.
Watchman Nee- Excerpt from The Spiritual Man Volume 1 Chapter 8