The goal of the spiritual life in essence is to love God above all things, to love our neighbor as we love ourselves and to conform our will to the will of God to the point that eventually we can say like St. Paul, "It is no longer I who lives, but Christ who lives in me". Our part in this relationship of loving God consists in prayer, and following God's commandments and the leading of the Holy Spirit. Spiritual direction not only focuses on the prayer life of the directee but on helping to discern God's will in particular for that person.
Holiness consists of doing God's will as we best understand it in the circumstances of our lives. This transforms us more and more until our desire is to follow God's will in all things, which the more one follows, the more one loves and realizes is the best and most desirable because God is infinitely all knowing and loving beyond what we can know or love.
One reason we seek God's guidance is that God is infinitely smarter and more loving than we are and He truly knows what is best, even if we can't understand why some things happen the way they do. So the goal of spiritual direction becomes helping the directee to more and more come to a love union with God and to conform their will more and more to God's will in their lives.
Mary is our model of uniting our will to God's will and said to the Angel Gabriel at the Annunciation, "Be it done unto me according to thy Word."