If our treasure is in heaven, it will be reflected in our lives on earth. William Gurnall presents three “particulars” by which we can judge our hearts in this regard.

If, indeed, heaven and heavenly things be the prize thou wrestlest for, thou wilt discover a heavenly deportment of heart, even in earthly things. Wherever you meet a Christian, he is going to heaven. Heaven is at the bottom of his lowest actions. Now observe thy heart in three particulars, in getting, in using, and in keeping earthly things, whether it be after a heavenly manner.
   (1.) Particular. [Observe thy heart] in getting earthly things. If heaven be thy chief prize, then thou wilt be ruled by a heavenly law in the gathering of these. Take a carnal wretch, and what his heart is set on he will have, though it be by hook or crook. A lie fits Gehazi’s mouth well enough, so he may fill his pockets by it. . . . Abraham scorned to be made rich by the king of Sodom, Ge. xiv. 23, that he might avoid the suspicion of covetousness and self-seeking; it shall not be said another day that he came to enrich himself with the spoil, more than to rescue his kinsmen. Nehemiah would not take the tax and tribute to maintain his state, when he knew they were a poor peeled people, ‘because of the fear of the Lord.’ Dost thou walk by this rule? wouldst thou gather no more estate or honour than thou mayest have with God’s leave, and will stand with thy hopes of heaven?
   (2.) Particular. [Observe thy heart] in using earthly things. Dost thou discover a heavenly spirit in using these things?
   (a) The saint improves his earthly things for an heavenly end. Where layest up thy treasure? dost thou bestow it on thy voluptuous paunch, . . . or lockest thou it up in the bosom of Christ’s poor members? what use makest thou of thy honour and greatness, to strengthen the hands of the godly or the wicked? And so of all thy other temporal enjoyments—a gracious heart improves them for God. When a saint prays for these things, he hath an eye to some heavenly end. If David prays for life, it is not that he may live, but live and praise God, Ps. cxix. 175. When he was driven from his regal throne by the rebellious arms of Absalom, see what his desire was and hope, ‘The king said unto Zadok, Carry back the ark of God into the city: if I shall find favour in the eyes of the Lord, he will bring me again, and shew me both it, and his habitation,’ 2 Sa. xv. 25. Mark, not ‘show me my crown, my palace,’ but ‘the ark, the house of God.’
   (b) A gracious heart pursues earthly things with a holy indifferency, saving the violence and zeal of his spirit for the things of heaven. He useth the former as if he used them not—with a kind of non-attendancy; his head and his heart is taken up with higher matters, how he may please God, thrive in his grace, enjoy more intimate communion with Christ in his ordinances; in all these he spreads all his sails, plies all his oars, strains every part and power. Thus we find David upon his full speed, ‘My soul presseth hard after thee,’ Ps. lxiii. And, before the ark, we find him dancing with all his might. Now a carnal heart is clean contrary, his zeal is for the world, and his indifferency in the things of God . . . When he is about any worldly business, he is as earnest at it as the idolatrous smith in hammering of his image, who, the prophet saith, ‘worketh it with the strength of his arms: yea, he is hungry, and his strength faileth: he drinketh not, and is faint,’ Is. xliv. 12. So zealous is the muck-worm in his worldly employments, that he will pinch his carcase, and deny himself his repast in due season, to pursue that. The kitchen there will wait on the shop; but in the worship of God, it is enough to make him sick of the sermon, and angry with the preacher, if he be kept beyond his hour. Here the sermon must give place to the kitchen. So the man for his pleasures and carnal pastime; he tells no clock at his sports, and knows not how the day goes . . . But at any heavenly work, O how is the man punished! time now hath leaden heels he thinks. All he does at a sermon is to tell the clock, and see how the glass runs. . . .
   (c) The Christian useth these things with a holy fear, lest earth should rob heaven, and his outward enjoyments prejudice his heavenly interest. He eats in fear, works in fear, rejoiceth in his abundance with fear. As Job sanctified his children by offering a sacrifice, out of a fear lest they had sinned; so the Christian is continually sanctifying his earthly enjoyments by prayer, that so he may be delivered from the snare of them.
   (3.) Particular. [Observe thy heart] in keeping of earthly things. The same heavenly law, which the Christian went by in getting, he observes in holding, them. As he dares not say he will be rich and honourable in the world, but if God will; so neither that he will hold what he hath. He only keeps them, until his heavenly Father calls for them, that at first gave them. If God will continue them to him, and entail them on his posterity too, he blesseth God; and so he desires to do also when he takes them away. . . . The Christian will expose all he hath in this world to preserve his hopes for another. Jacob, in his march towards Esau, sent his servants with his flocks before, and came himself with his wives behind; if he can save anything from his brother's rage, it shall be what he loves best: if the Christian can save anything, it shall be his soul, his interest in Christ and heaven, and then no matter if the rest go . . .

—William Gurnall, The Christian in Complete Armour (Banner of Truth Trust, 2002), 1:220–222.