The Holy Ghost - is a witness to us - The words are quoted from Jeremiah 31:33, Jeremiah 31:34, and here we are assured that Jeremiah spoke by the inspiration of the Spirit of God. Had said before - See Hebrews 8:10, Hebrews 8:12, and the notes there.

Hebrews 2:3,4 How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord...

Hebrews 3:7 Why (as the Holy Ghost said, To day if you will hear his voice,

Hebrews 9:8 The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest...

2 Samuel 23:2 The Spirit of the LORD spoke by me, and his word was in my tongue.

Nehemiah 9:30 Yet many years did you forbear them, and testified against them by your spirit in your prophets: yet would they not give ear...

John 15:26 But when the Comforter is come, whom I will send to you from the Father, even the Spirit of truth, which proceeds from the Father...

Acts 28:25 And when they agreed not among themselves, they departed, after that Paul had spoken one word...

1 Peter 1:11,12 Searching what, or what manner of time the Spirit of Christ which was in them did signify...

2 Peter 1:21 For the prophecy came not in old time by the will of man: but holy men of God spoke as they were moved by the Holy Ghost.

Revelation 2:7,11,17,29 He that has an ear, let him hear what the Spirit said to the churches; To him that overcomes will I give to eat of the tree of life...

Revelation 3:6,13,22 He that has an ear, let him hear what the Spirit said to the churches...

Revelation 19:10 And I fell at his feet to worship him. And he said to me, See you do it not: I am your fellow servant...

June the Fourteenth the Law in the Heart
"I will put My laws into their hearts." --HEBREWS x. 16-22. Everything depends on where we carry the law of the Lord. If it only rests in the memory, any vagrant care may snatch it away. The business of the day may wipe it out as a sponge erases a record from a slate. A thought is never secure until it has passed from the mind into the heart, and has become a desire, an aspiration, a passion. When the law of God is taken into the heart, it is no longer something merely remembered: it is something …
John Henry Jowett—My Daily Meditation for the Circling Year

The Inward Laws
I will put My laws into their hearts, and in their minds will I write them. Their sins and iniquities will I remember no more.' (Hebrews x. 16, 17.) The beginnings of religion lie in the desire to have our sins forgiven, and to be enabled to avoid doing the wrong things again. It was so with David when, in the fifty-first Psalm, he not only cried, 'Have mercy upon me, O God, and blot out my transgressions', but 'Wash me, cleanse me from my sin'. Sin is a double evil. On the one hand, it creates …
T. H. Howard—Standards of Life and Service

Like one of Us.
"But a body Thou hast prepared Me."-- Heb. x. 5. The completion of the Old Testament did not finish the work that the Holy Spirit undertook for the whole Church. The Scripture may be the instrument whereby to act upon the consciousness of the sinner and to open his eyes to the beauty of the divine life, but it can not impart that life to the Church. Hence it is followed by another work of the Holy Spirit, viz., the preparation of the body of Christ. The well-known words of Psalm xl. 6, 7: "Sacrifice …
Abraham Kuyper—The Work of the Holy Spirit