Love for me, is being willing to sacrifice for the sake of another. And not only when you FEEL like it, or it benefits you.
I DON'T mean being willing to sacrifice your morals and ethics, or your own health, and for no good reason, being a doormat, letting people abuse you, etc.
I mean keeping commitments, even when it's difficult to do so. (Marriage, raising kids, etc.)
I mean being willing to sacrifice immediate gratification, time, effort, energy, material things, and even your life, if necessary(if the situation calls for it), for the sake of another. Even when there is no immediate, tangible reward.
I like this passage of Scripture:
John 15:13
This was exemplified by Christ on the cross. Laying down one's life for the sake of others, people who can NEVER repay, and even when they don't deserve it.
Altruism. "Agape Love".
Blessing those who curse you.
I believe this is the highest, outward expression of love.