Humility is another grace requisite. Set your hearts before God in an humble obedient frame. "Thou shall fear the Lord thy God, and serve Him, and swear by His name." The apostle Paul was sensible of this engagement, even in the very act of this duty. "I call God to witness, whom I serve in my spirit:" although it be a work of the lips, yet the heart, and the whole man must be interested, if we expect this worship to be acceptable. "Accept the free-will offering of my mouth, and teach me Thy judgments." Also it must be done in the greatest simplicity and plainness of spirit, in respect of those with whom we covenant; we call God as a witness betwixt us, who searcheth the heart: "With Him is wisdom and strength, the deceived and deceiver are His." He hath wisdom to discover, and strength to punish, if our hearts be not upright to our brethren in this matter. Let us be contented with this, that the words of our covenant be bands; it may not be, so much as in the desire of our hearts, that they should become snares, no not to the weakest and simplest person that joineth with us. On the whole work make your address unto God, as Jacob did to his father Isaac, and let there be the like fear and jealousy over your spirits. "My father peradventure will feel me, and I shall seem to Him as a deceiver, and I shall bring a curse upon me, and not a blessing." I take liberty with more earnestness to press this care upon you, because I have observed oaths and covenants have been undertaken by us formerly, and by the command of authority, the fruit whereof, though great, yet answered not our expectation; the Lord surely hath been displeased with the slightness of our hearts in the work. I beseech you be more watchful, and stir up your hearts with more industry this day than ever before. As it is the last oath you are likely to take in this kind, so it is our last refuge, _Tabula post naufragium_. If this help us not, we are likely to remain to our dying day an unhappy people; but if otherwise, "You will indeed swear with all your hearts, and seek the Lord with your whole desire, God will be found, and give you rest round about."