Imagine you could see a map of all the people you have ever met, and on that map you could see the person plus the person you were when you interacted with them.
You would very quickly notice that you were not the same with each person. With some people you were like an enemy, with others there was a special friendship, and still with others you passed them by like they meant nothing at all.
It's because we did not love unconditionally. We had special rules about who gets what, who deserves what, who we will be fully open and honest with, whether we're allowed to be open with people, and whether we'd dare to disrupt the social status quo by being consistently authentic.
Notice probably that in your map of life, you probably only loved very few people, out of all those you met. You were, in a way, held 'inside of' a way of living that is founded in fundamental conditionality. The ego mindset. Different responses for different people. Different relationships to different people. Seeing people as not Christ and not the same and not as lovable as the rest.
Imagine then that you break out of this structure, and decide that you're going to love every single person the same by seeing every person AS the same, by overlooking everything that suggests they are different, fixating on the fact they are CHRIST, holy and innocent. Then your response is always the same.
Unconditional love. It's a whole different way of living.