Let's speak of the most basic assurance needed, that one is a child of God.
That assurance comes only from the witness of the Spirit. It is given only by asking in prayer, and for some, they must ask, seek, knock almost to the point of despair. They WOULD despair if God did not answer. No sight or sound in this world will do.
We understand your point, but you make it very badly.
How does the Spirit do this, Aaron? Through some emotional feeling?
Is your assurance based on a feeling "in your heart" or is it based on facts?
Faith, in the original (pisteuo), means to be fully persuaded. It has nothing to do with "feelings."
Obviously you do NOT understand my point.