if we sing his praise, it should be with melody in our hearts to the Lord; herein lies powerful godliness; and godliness is the ground-work of internal worship, and without which there can be no worshipping God aright, and therefore it deserves our first consideration.https://www.monergism.com/worship-god-or-practical-religion-ebook
hearts always needed the removal and replacement that Ezekiel spoke of, so that the divine inscription of the principles of the Decalogue would be a delight rather than bondage, but the only means by which that was ever achieved and the only guarantee that it will continue in the people of God is in the mediator of the new covenant. Its newness and superiority lie in him. Far from expressing hostility towards the law or commanding a blunt assertion that the law is obsolete, he confirms that the laws inscribed in stone do not pass away.From the Finger of God, 318
Knowledge and affection mutually help one another; it is good to keep up our affections of love and delight by all sweet inducements and divine encouragements, for what the heart likes best the mind studies most. Those that can bring their hearts to delight in Christ know most of His ways.
The heart of a Christian is Christ's garden, and His graces are as so many sweet spices and flowers, which His Spirit blowing upon makes them to send forth a sweet savor. Therefore, keep the soul open for entertainment of the Holy Ghost, for He will bring in continually fresh forces to subdue corruption, and this most of all on the Lord's Day.
David had sat many months under the lectures of the law, unhumbled for his complicated sin, but Nathan is sent to preach a rehearsal sermon to him of the many mercies that God had graced him with, and while those coals are pouring on his head, his heart dissolves presently (2 Sam. 12:13). The frost is seldom quite out of the earth till the sun hath gotten some power in the spring to dissolve its bands. Neither will hardness of heart be removed until the soul be thoroughly warmed with the sense of God's mercies.
if the heart is not engaged in worship bodily exercise is of little advantage, that being only the form without the power of godliness; yea vain is such worship where the heart is far removed from God.https://www.monergism.com/worship-god-or-practical-religion-ebook
Believing, repenting, and the like, are the product of the new nature; and can never be produced by the old corrupt nature. The heart is shut against Christ: man cannot open it, only God can do it by his grace.
So a man that hath a watch and understands the use of every wheel and pin, if it goes amiss, he will presently find out the cause of it; but one that hath no skill in a watch, when it goes amiss, he knows not what the matter is and therefore cannot mend it. So indeed, our hearts are as a watch, and there are many wheels and windings and turnings there, and we should labor to know our hearts well, that when they are out of tune we may know what the matter is.
A sincere heart is like a clear stream in a brook: you may see to the bottom of his plots in his words and take the measure of his heart by his tongue.
They do not love the law that are always full of excuses, and pretend occasions to neglect the service of God; excuses are always a sign of a naughty heart.
Conversion is not the smooth, easy-going process some men seem to think.... It is wounding work, of course, this breaking of the hearts, but without wounding there is no saving.... Where there is grafting there is a cutting, the scion must be let in with a wound; to stick it on to the outside or to tie it on with a string would be of no use. Heart must be set to heart and back to back, or there will be no sap from root to branch, and this I say, must be done by a wound.
Spiritual things truly satisfy! The more that heaven is in us—the less earth that will content us. He who has once tasted the love of God, his thirst is much quenched towards earthly things. The joys of God's Spirit are heart-filling and heart-cheering joys; he who has these, has heaven begun in him!https://gracegems.org/Watson/art_of_divine_contentment2.htm