How could we understand that God is Love?

 "Love" is a very common word we used to say and sometimes it was misused. These are many kinds of love such as parents' love, friends' love, husband and wife's love, lovers' love, and so on. Actually, love is abstract as well as very difficult to define. But, how could we know that love is there in the world? How could you feel it?
 For that question, we have answers and reasons. For that answers, we have to ask only one question to ourselves. Do we really need love? or Without love, could we survive? It is very difficult for us to survive without love. Because of this if we "fall out of love" in our family, how are we to fix it up? Because of these, the divorce rate is extremely high in today's society. We really need love. Our love is sometimes very conditional and mercurial. For that love only, people got married, people got fought for it and had conflict over it. If we stop loving one another, we no longer feel love for each other. Could we call that love?
 So, Shall we think about our parents' love? Though we are good or bad, they have no expectation from us and their love for us is not stopping. God's love is very similar to parents' love. I mean, very similar but not the same because God's Love is very hard to comprehend from the point of view of humans.
 God's Love is eternity and unconditional but how could we prove for it? Why does he love us? Are we lovable? or Could we make him feel happy? Actually, God's Love is very different from human love. Though we are sinners, He wants us to have a loving relationship with Him. His love is not based on feelings or emotions. We could see His nature in the Holy Bible.
 Anyhow, God really loves us because He is Love.