3. That he must depend on, hope, and pray for the testimony of the Spirit, with his spirit, that he is a child of God. It will be a difficult matter for us to conclude that we have the truth of grace, till the Spirit is pleased to shine on his own work; which, when he does, all things will appear clear and bright to us, though before this we might walk in darkness, and have no light. In speaking concerning the inward testimony of the Spirit (which is necessary to enable a believer to discern in himself the marks of grace, on which his assurance of salvation is founded) let it be premised; that as it is a branch of the Spirit’s divine glory, by his internal influence, to deal with the hearts of his people; so he does this various ways, according to the various faculties of the soul, which are the subjects thereof; particularly, when by his power, he renews the will, and causes it to act those graces which are the effects of his divine power; then he is said to sanctify a believer. But when he deals with the understanding and conscience, enabling us to discern the truth of the work of grace, that we may take the comfort of it, then he is described, in scripture, as a witness hereunto, or as witnessing with our spirits, that we are in a state of grace, the consequence of which is, that _the eyes of_ our _understanding being enlightened_, we _may know what is the hope of his calling_, Eph. i. 18. accordingly he gives us to discern that he has called us by his grace; and, as the result thereof, granted us a hope of eternal life.