Sometimes we have to search a bit. But as Trungpa Rinpoche used to say, Everybody loves something. Even if it's just tortillas. The point is to touch in to the good heart that we already have and nurture it. At other times we can think of a person or situation that automatically evokes compassion.
Compassion is our capacity to care about others and our wish to alleviate their pain.
It is based not on pity or professional warmth, but on the acknowledgment that we are all in this together. Compassion is a relationship between equals. Love and compassion are like the weak spots in the walls of ego. They are like a naturally occurring opening. And they are the opening we take.