John Flavel said this quote

Above all the studies in the world, study your own hearts; waste not a minute more of your precious time about frivolous & unsubstantial controversies. My dear flock, I have, according to the grace given me, labored in the course of my ministry among you, to feed you with the heart strengthening bread of practical doctrine, and I do assure you, it is far better you should have the sweet and saving impressions of gospel truths, feelingly and powerfully conveyed to your hearts, than only to understand them by a bare ratiocination, or a dry syllogistical inference. Leave trifling studies to such as have time lying on their hands and know not how to employ it. Remember you are at the door of eternity, and have other work to do. Those hours you spend upon heart-work in your closets, are the golden spots of all your time and will have the sweetest influence up to your last hour.

~ John Flavel

The world is not a theater large enough to display the glory of Christ upon or unfold even half of the unsearchable riches that lie hidden in Him. And such is the deliciousness of this subject, Christ, that were there ten thousand volumes written upon it, they would never become tiring to the heart. We used to say that any one thing can finally tire us and this is true, except about this one eminent thing, Christ, and then one can never tire, for such is the variety of sweetness in Christ.

~ John Flavel

A saving, though an immethodical knowledge of Christ, will bring us to heaven, John 17: 2, but a regular and methodical, as well as a saving knowledge of him, will bring heaven into us, Col. 2: 2, 3.

~ John Flavel

He embraces all things that are lovely: he seals up the sum of all loveliness. Things that shine as single stars with a particular glory, all meet in Christ as a glorious constellation. Col. 1:19, It pleased the Father that in him should all fullness dwell. Cast your eyes among all created beings, survey the universe: you will observe strength in one, beauty in a second, faithfulness in a third, wisdom in a fourth; but you shall find none excelling in them all as Christ does. Bread has one quality, water another, raiment another, medicine another; but none has them all in itself as Christ does. He is bread to the hungry, water to the thirsty, a garment to the naked, healing to the wounded; and whatever a soul can desire is found in him, 1 Cor. 1:30

~ John Flavel