That God would make him conscious of any wrong desires or motives that might hinder the blessings of God upon his life. We ought to do the same. We should ask God to look into the very center of our lives. And ask that He reveal to us anything in our hearts that might prevent us from being what we need to be in this coming year. Much the same as we test and prove metals to evaluate their purity.
Gold is heated time and again to bring all the impurities to the surface where they can be removed.
That is what David is asking God to do. Read his mind. Lead Me in the Way Everlasting. A. David asks God for direction and guideance. That means we must admit that we need His direction in our lives.