John Wesley on True Religion

But true religion, or a heart right towards God and [humanity], implies happiness, as well as holiness. For it is not only righteousness, but also “peace and joy in the Holy Spirit.” What peace? The peace of God, which God only can give, and the world cannot take away, the peace which “passes all understanding,” all (barely) rational conception, being a supernatural sensation, a divine taste of “the powers of the world to come,” such as the natural man [or woman] knows not, how wise soever in the things of this world, nor, indeed, can know it, in his [or her] present state, “because it is spiritually discerned.” It is a peace that banishes all doubt, all painful uncertainty, the Spirit of God bearing witness with the spirt of a Christian, that he [or she] is a child of God.