Not just love but compassion has to drive discipline. Love comes from recognizing one's merits and positive qualities (discipline channels and directs those strengths and weeds out the negative). Compassion is unconditional love. It is love just for the sake of love, not considering the others position. Tiferet is a result of total selflessness in the eyes of G‑d. You love for no reason; you love because you are a reflection of G‑d.
Does my discipline have this element of compassion?
Exercise for the day: Be compassionate to someone you have reproached.