If you stub your toe, you don't need to dialog yourself to be good to your foot, do you? When you see things that clearly, there's no dialogue or emotional manipulation that you need to do to extend compassion to that being, because that being is a part of you, and if that being hurts, you hurt.
When you meet your guru or a being who knows, who is no longer loving, but has become love, a being who is sitting in truth, and in compassion and kindness for all beings - you know. When I met my guru, I knew. And it was before I met him physically, actually.
Compassion is a college education. It's a doctorate.