“The fundamental goal of childrearing concerns who and what they love. Some may want to substitute other verbs, thinking the children have been brought up well based on what they earn, what they think, and what they say. Of course, what we love will affect all these others, but who and what we love is still central.
“The greatest commandment in Scripture comes in the context of a passage on childrearing. We are to love the Lord our God with all our hearts, souls, minds, and strength. We are to do this self-consciously, because in this passage we are responsible to teach our children how to do the same things. Love is a communicable attribute of parents.” (My Life for Yours, p. 127)
You Think Too Much! 
I beg to differ with you on your title. I hope you don’t truly believe all you need is love. Love is great and a vital part of childbearing, but children do need more then just love.
I am not sure if you ever heard of Maslow’s Hierarchy or not, I actually learned of it in a secular course of educational pyschology.
Here is link to what I am talking of
http://chiron.valdosta.edu/whuitt/col/regsys/maslow.html
Although I am not an advocate of secular pyschology or humanism, I dare say that there is truth to this triangle.
Love doesn’t feed the body or warm it. It doesn’t keep it safe from danger. The body can’t survive on love alone, it would be nice if it could, but it is physically impossible.
I have heard of Maslow’s hierarchy. It’s true that it’s hard to learn when your stomach is empty. His theory has brought us school lunches and now breakfast also.
I think the title is a play off of a popular tune from the past. But I don’t really know for sure.–>