John Trapp on Jeremiah 17:10

Ver. 10. I the Lord ſearch the heart] Be it never ſo full of ſhifts and fetches, I cannot be deceived in it. The watch-maker muſt needs know every turning and winding in the watch. God is the heart maker, and the heart-mender, neither is there any creature (no not any creature of the heart) that is not manifest in his ſight: but all things are naked and opened before his eyes, Heb. 4.13. Naked for the outſide, and opened for the inſide: [non-Latin text not transcribed]. diſſected, quartered, and as it were cleft thorough the back-bone, as the Apoſtles word there ſignifieth: ſo opened, as the entrailes of a man that is anatomized, or of a beaſt that is cut up and quartered. The heart and reines are taken to be the ſeat of the thoughts and affections, yea of the ſtrongeſt affection, namely that which is for generation. Theſe are a mans inwardeſt and moſt remote parts: ſo that it is hard for food or Phyſick to come at them. Covered they are alſo with fat and fleſh, &c. and yet they are not hid from Gods eye, which is indeed a fiery eye, Rev. 1.14. and therefore needeth no outward light. Mans eye is like a candle, which is firſt lighted, and then extinct: The Angels eyes are like the ſtars which ſhine indeed, and in the dark too; but with a borrowed light: neither know they the thoughts of mens hearts, further then they are diſcovered. But Gods eye is like the Sun, yea far brighter, and more peircing then that eye of the world: neither needeth he a window in mans breaſt (as Momus wiſht) to look in at: for every man, before God, is all window, totus totus tranſparens & pellucidus, This, Thales and other Philoſophers ſaw and confeſſed.