Love is not preference, kindness, or infatuation. Love is not good feelings.
Modern atheists, like Richard Dawkins, have pointed out the natural prediliction for survival - the selfish nature of living things. Love is contradictory to our human nature. That means it doesn't come easily, and it doesn't feel good. That also means it doesn't come from us.
Love is a gift of God. But what is it?
On love of neighbor, James asks a rhetorical question. "What good is it, my brothers, if someone says he has faith but does not have works? Can that faith save him?" (James 2:14) Paul tells us that what counts is faith working through love. (Gal 5:6)
Think about your own experiences. What is more important, what someone says to you or what someone does? Watch the news or an late-night police reality show and after very little time, you'll see evidence of the difference. Jesus gave us the commands to love God and love each other - to obey the first three commandments about relation to God, and the remaining seven about relation to neighbor.  What is love? It's action. Love is your faith going to work outside of yourself. (Hope, in contrast, is your faith applied to your own life and prayer.)
Paul tells us that love is the greatest of the three, the one that will endure forever. (1 Cor 13:13) In Heaven, our faith will be proven true and our hope fulfilled. Our love will go on. We will act on love forever.
But we must start now.
Today, pray for the grace to see that opportunity - that chance to act in love for a friend, a family member, or a stranger.