Our heart/spirit/soul is always guiding us, not in the same way the mind communicates. Our heart communicates intuitively. When our heart speaks its instantaneously and its always guiding us into places that the mind may not see as logical or rational.
Our mind will always want our hearts to guide us in a way that feels comfortable and certain, but the very nature of the hearts guidance will many time be into the unknown where we become dependent on inner guidance and surrendering to our destiny. Destiny will always have the flavor of unknowing to the mind part of us.
Living life so that the unknown is always present is a sign your following you hearts guidance. Living life so that only this present moment has substance, is living the life of the heart.