We are to plead the promise against sin at the throne of grace

DIRECTION FOURTH. Plead the promise against sin at the throne of grace. He that hath law on his side, we say, may sue the king; and he that hath a promise on his side may, with a humble boldness, commence his suit with God. As the veins in the body have arteries to attend them with spirits, so precepts in the word have promises to inspirit the Chris¬tian, and empower him with strength for his duty. Is there a command to pray? There is also a promise to enable for prayer, Zech. 12:10; Rom. 8:26. Doth God require us to give him our heart? ‘My son, give me thine heart,’ Prov. 23:26. The promise saith, ‘A new heart also will I give you,’ Eze. 36:26. Doth he command us to mortify our corruptions? And doth he not promise, ‘Sin shall not have dominion over us?’ Rom. 6:14. Now, to obtain this promise, thou must plead and press it believingly at the throne of grace. Quod lex imperat, fides impetrat—what the precept com¬mands, the prayer of faith begs and receives. Look, therefore, thou takest God in thy way. First besiege heaven, and then fear not overcoming sin and hell, when thou hast conquered heaven. Now thou warrest at God's cost, and not thy own. He that sets thee on will bring thee off. David was a man at arms, and could handle his weapon against this enemy as well as another, yet dares not promise himself success till he hath made God his second. ‘Order my steps in thy word: and let not any iniquity have dominion over me,’ Ps. 119:133. 

But if thou thinkest to steal a victory by the strength of thy own resolution, expect an over¬throw. And it will be a mercy thou shouldst be so served; for a foil will learn thee humility for the future, but a victory would increase thy pride. And that is a sad victory, when one sin carries away the spoils which thou hast taken from another. Jehoshaphat took the right course to speed, who, though he had almost a million men he could draw into the field—and that without draining his garrisons—yet bespeaks God’s help, as if he had not a man to fight for him: ‘We have no might against this great company that cometh against us; neither know we what to do: but our eyes are upon thee,’ II Chr. 20:12. If an Alexander, or a Cæsar, had been at the head of such an army, I warrant you they would not have known what to have done, and not doubted all before them. But Jehoshaphat, a holy humble man, was better instructed. He knew a host signifieth nothing which hath not the Lord of hosts with them; and that the most valiant can find neither heart nor hand in the day of battle without his leave who made both. Nor wilt thou, Christian, be able to use thy grace in an hour of temptation, without new grace from God to excite and enforce what thou hast already received from him. And if thou expectest this from him, he expects to hear from thee. Neither speaks it God unwilling to give what he hath promised, because he pays not the debt of the promise until it be sued for at the throne of grace. No, God takes this method, only to secure his own glory in the giving, and also to greaten our comfort by receiving it in this way of prayer, which is a fit expedient to attain both.