Love is very powerful, obviously.
Many people have trouble describing it, and I believe if you CAN describe love, you haven't truly felt it.
It's just a feeling that you KNOW is there when you're with a certain someone and you care about them deeply and would lay your life down a million times over for them. This person is (obviously) the most special person in your life, and when the feeling just HITS you, you know it.
It really is indescribable ;)