“When the Spirit of truth comes, He will guide you into all the truth, for He will not speak on His own authority, but whatever He hears He will speak, and He will declare to you the things that are to come.” -John 16:13
Truth is like a vast cavern into which we desire to enter, but we are not able to traverse it alone. At the entrance it is clear and bright; but if we would go further and explore its innermost recesses, we must have a guide, or we shall lose ourselves. The Holy Spirit, who knows all truth perfectly, is the appointed guide of all true believers, and He conducts them as they are able to bear it, from one inner chamber to another, so that they behold the deep things of God, and His secret is made plain to them.
What a promise is this for the humbly inquiring mind! We desire to know the truth and to enter into it. We are conscious of our own aptness to err, and we feel the urgent need of a guide. We rejoice that the Holy Spirit is come and abides among us. He condescends to act as a guide to us, and we gladly accept His leadership. “All truth” we wish to learn, that we may not be one-sided and out of balance. We would not be willingly ignorant of any part of revelation lest thereby we should miss blessing or incur sin. The Spirit of God has come that He may guide us into all truth: let us with obedient hearts hearken to His words and follow His lead.
[from Faith’s Checkbook by Charles H. Spurgeon]