Behold, you desire truth in the inward parts: and in the hidden part you shall make me to know wisdom.
The true knowledge of the way of grace must be sought from God Himself. He alone can make you know the hidden wisdom. The human knowledge Of the way of grace which we obtain by the use of our understanding is not sufficient. Mark well: we do not say that this knowledge is not necessary. But this knowledge is not enough. It is possible that one may have a well-nigh perfect knowledge of God's Word and yet be lost. And when we have clear insight into the way of the truth of God, we run just as much risk of resting content with it. Perhaps some one thinks that such a representation is sufficient to make one altogether dispirited. It would indeed be so were it not that we can say in this prayer, "In the hidden parts Thou shalt make me to know wisdom." God gives the wisdom. This is our only security, and that is the only answer that we can give to the question: How do we know if we have a right spiritual knowledge of grace? The Lord can and will make you assured of this. Conversion, faith, is not a work that you must do, and on which you can look back and say, "That is well done." ,No: the innermost essence of conversion and faith consists in coming to God in surrender to God, in receiving from God the living God, grace to be worked out by Him, in being washed and purified from sin by Him. And just at this point is there in the religion of many so much defect. They do not know that in grace the principal element is that we must come into contact with the living God, and must experience the power of the Almighty.
Parallel VersesKJV: Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.