M. Scott Peck said, "One result of the mysterious nature of love is that no one has ever, to my knowledge, arrived at a truly satisfactory definition of love. In an effort to explain it, therefore, love has been divided into various categories: eros, philia, agape; perfect love and imperfect love, and so on. I am presuming, however, to give a single definition of love, again with the awareness that it is likely to be in some way or ways inadequate. I define love thus: The will to extend one’s self for the purpose of nurturing one’s own or another's spiritual growth." (The Road Less Traveled, 1978, p. 81)

As we discussed this in class we learned - Philia is brotherly love, Eros is is passionate love feelings & attraction, and Agape is Godlike love compassion, independent, even for those you don't even know. 
I Love learning about these for spouse we should have all. And knowing how wonderful it is to have children it helps me describe and identify the pure love I have for them.