Assurance of faith is the conviction that one belongs to Christ through faith and will enjoy everlasting salvation.
It is more than believing the gospel - it is believing that these truths apply to you.
Having assurance affects life in more ways than forgiveness of sin, alleviation of guilt, and salvation from the punishment of hell - it affects your whole being, firing up your affections for Christ, your unshakable trust in God, your burden for the unsaved and your joy in life and even death.
