(2.) Secondly, Duties and services are more apparently vitiated by _human additions_; a thing expressly contrary to the second commandment, and yet is there a strange boldness in men this way, which sometimes riseth to such a height, that the plain and clear commands of God are violated under the specious pretence of decency, order, and humility; and nothing doth more take them than what they devise and find out. Satan knows how displeasing this is to God, and how great an inclination there is in men to be forward in their inventions and self-devised worship, that he can easily prevail with the incautious. This was the great miscarriage of the Jewish nation all along the Old Testament; and of the pharisees, who, though they declined the idolatries of their fathers, yet were so fond upon their traditions, that they made their worship vain, as Christ tells them. And this humour also in Paul’s time was insinuating itself into Christians, managed by a great deal of deceit [Col. ii. 8] and ‘show of wisdom,’ ver. 23, which accordingly he doth earnestly forewarn them of. There are indeed several degrees of corrupting a service or ordinance by human additions, according to which it is more or less defiled: yet the least presumption this way is an offence and provocation. (3.) Thirdly, Duties are vitiated _in their excess_. Natural worship, which consists in fear, love, faith, humility, &c., can never be too much, but instituted worship may. Men may preach too much, and pray too long—a fault noticed by Christ in the pharisees; they made ‘long prayers’—Even in duties, a man may be righteous overmuch. Timothy was so in his great pains and over-abstemious life, to the wasting of his strength—which the apostle takes notice of, and adviseth against it, ‘Drink no longer water,’ &c., [1 Tim. v. 23.] The Corinthians were so, when out of a high detestation of the miscarriage of the incestuous person, they were backward to forgive him, and to receive him into the church again. Peter is another instance to us of excess, John xiii. 8. First, in a modest humility, he refuseth to let Christ ‘wash his feet;’ but after understanding the meaning of it, then he runs to the other extreme, and offers not ‘only his feet, but his hands and his head.’ When the servants of God are conscious of defects in their services, as if they would make amends for these by the length and continuance of their services, they are easily drawn into an excess every way disadvantageous to themselves and the service. III. Thirdly, When Satan’s designs do not take to spoil the duties, either by the manner of the attempt or in the act, he then seeks to play an after-game, and endeavours to spoil them _by some after-miscarriage of ours in reference to these services_. As,