Excerpt from The Search for Meaning by Victor Frankl

Love is the only way to grasp another human being in the innermost core of his personality. No one can become fully aware of the essence of another human being unless he loves him. By his love he is enabled to see the essential traits and features of the beloved person; and even more, he sees that which is potential in him, which is not yet actualized but yet ought to be actualized. Furthermore, by his love, the loving person enables the beloved person to actualize these potentialities. By making him aware of what he can be and of what he should become, he makes these potentialities come true.