Cotton Mather distinguishes the grounds of assurance this way. . .Posted: October 23, 2013
There is a Testimony of the Holy SPIRIT unto our Adoption, which comes as a Mighty Light, more Directly breaking in upon our Minds, to assure us, that we are indeed the Adopted of GOD. There is a Discursive Assurance of our Blessedness; which is drawn from the Marks and Signs of a Soul become an Habitation of God thro’ the Spirit. And then there is a more Intuitive Assurance of it; In which the Holy SPIRIT, more Immediately, and most Irresistibly, and with a Mighty Light, bears in upon the Mind of the Beleever a powerful perswasion of it, That he is a Child of GOD, and his GOD and Father will one day bring him to Inherit all things. The Soul of the Beleever is now wonderfully moved and melted and overpowered with such Thoughts as these; GOD is my Father, CHRIST is my Saviour, and I have an Inheritance in the Heavens reserved for me.