Should anyone ever find reason to ask me why I love a certain person (I'm not talking about a certain person here--though I might as well be--but rather just any person that someone might, for whatever reason, want to know the specific reason why I love them), I will refer them to page 119 of Robert L. Short's excellent book, The Gospel According to Peanuts where it says:
Both love and faith can never give a reason for their love; they can only say,This is my beloved(Song of Sol. 5:16). But perhaps this is just as well: for if the lover, or believer, could give us areasonfor loving this love, such as her greatbeautyorcharmorwealth,then it is quite obvious that the lover would not actually be in love with hislove,but that his real heart's desire would be beauty or charm or wealth or whatever hisreasonmight be for loving the supposed object of his love. Thus it is impossible for one to have this kind of ulterior motive and remain a true lover...
Note: emphasis and quotation left intact from original publication