He did what he could to keep his people at Kidderminster free from a concern in the public changes. He kept them from taking the Covenant, as fearing it might be a snare to their consciences: nay, he prevented its being much taken in all that county. When the Engagement came out, he spake and preached against it, and dissuaded men from taking it. He had a whole day's disputation with Mr. Tombs, in his church at Bewdley, upon infant baptism; and thereby kept his people free from the spreading notions of those times. When the army was going against King Charles II. and the Scots, he wrote letters to several of the soldiers to tell them of their sin, and desired them at last to begin to know themselves. And instead of praying for their success in public, he freely inveighed against the forcing men to run to God upon such errands of blood and ruin; especially where brethren were concerned. He often and various ways declared against Cromwell's usurpation, when he had got the ascendant: he preached once before him after he was Protector, by means of the Lord Broghill and the Earl of Warwick: his text was 1 Cor. i. 10. The design of his sermon was to show how mischievous it was for politicians to maintain divisions in the church for their own ends. A little while after the Protector sent for him, and made a speech to him of an hour's length, about the providence of God in changing the government, and favouring that change by such great things done at home and abroad. Mr. Baxter freely told him, that the honest people of the land took their ancient monarchy to be a blessing; and desired to know how they had forfeited that blessing, and to whom the forfeiture was made. He with some passion replied, that there was no forfeiture, but God had changed it as it pleased him.
In the controversy about church government, which was then so hotly agitated, Mr. Baxter was all along against extremes. He neither fell in with the Erastian, nor episcopal, nor presbyterian, nor independent party entirely; but thought all of them had so much truth in common among them, as would have made these kingdoms happy, had it been unanimously and soberly reduced to practice, by prudent and charitable men. At the desire of the neighbouring ministers he drew up an agreement for church order and concord, containing only so much church order and discipline, as he apprehended the episcopal, presbyterian, and independent were agreed in, as belonging to the pastors of each particular church; which he afterwards published in a book called "Christian Concord:" and the ministers of those parts associated upon that bottom; not disputing with each other in order to an agreement in their opinions, but agreeing in the practice of what was owned by all.
Upon Oliver's becoming Protector, the extent of the toleration was the subject of many debates. The committee of parliament proposed that it should be extended to all that held the fundamentals of religion: hereupon it was queried which were the fundamentals of religion? and it was agreed that the members of the committee, who were fourteen in number, should each of them nominate a divine; and that they meeting together, should draw up a list of the fundamentals, to be as a test to the toleration. Mr. Baxter was upon this occasion nominated for one, (in the room of Archbishop Usher, who refused,) by the Lord Broghill, and took a journey accordingly to London. There he met Mr. Marshal, Mr. Reyner, Dr. Cheynel, Dr. Goodwin, Dr. Owen, Mr. Nye, Mr. Sydr. Sympson, Mr. Vines, Mr. Manton, and Mr. Jacomb, who were also nominated. Mr. Baxter was for offering to the parliament the creed, the Lord's prayer, and ten commandments, as the fundamentals of christianity: but the rest were not for so large a bottom, but were for having a greater number of fundamentals. If he did no other service among them, he at least prevented the running many things so high as might otherwise have been expected.
Truth and peace were the things he earnestly pursued all his days. He by writing treated with Dr. Brownrigg, bishop of Exeter, about concord with the diocesan party in this nation: and made also some proposals to Dr. Hammond to this purpose, a little before the Restoration of King Charles. By means of Mr. Lamb and Mr. Allen, two anabaptist ministers, whom he prevailed with to quit the way of separation, he dealt with the rest of the anabaptists, about communion with other churches. He treated with Mr. Nye about an agreement with the independents, in a moderate scheme; and he was often engaged in disputes with the papists also. And indeed it is amazing how one of so much weakness, who was constantly followed with divers bodily infirmities, should be capable of so much service.