Men are very prone to be deceived about their own state, to think themselves something when they are nothing, and to suppose themselves "rich and increased in goods, and to have need of nothing, when they are wretched, and miserable, and poor, and blind, and naked." They are greatly deceived about the principles they act from. They think they are sincere in that in which there is no sincerity. And that they do those things from love to God, which they do only from love to themselves. They call mere speculative or natural knowledge, spiritual knowledge; and put conscience for grace; a servile, for a childlike fear; and common affections, that are only from natural principles, and have no abiding effect, for high discoveries, and eminent actings of grace. Yea, it is common with men to call their vicious dispositions by the name of some virtue. They call their anger and malice, zeal for a righteous cause, or zeal for the public good. And their covetousness, frugality.
They are vastly deceived about their own righteousness. They think their affections and performances lovely to God, which are indeed hateful to him. They think their tears, reformations, and prayers, sufficient to make atonement for their sins, when indeed if all the angels in heaven should offer themselves in sacrifice to God, it would not be sufficient to atone for one of their sins. They think their prayers and works, and religious doings a sufficient price to purchase God's favor and eternal glory. When, as they perform them, they do nothing but merit hell.