If we don't have compassion we don't have anything. Before every miracle Jesus performed He felt compassion for the ones who needed that miracle (except the water into wine one at Cana -- that was just cause His Mama asked).
If we don't have compassion we can't do His work the right way.
If we don't have compassion we will make a mess of things. Big time.
"The LORD's lovingkindnesses indeed never cease, For His compassions never fail." Lamentations 3:22
Compassion is not pity or sympathy. Compassion is care and love.
"put on a heart of compassion, kindness, humility, gentleness and patience." Colossians 3:12
Deep awareness of the suffering of another coupled with the wish to relieve it. See Synonyms at pity.
http://FreeDictionary.com says compassion is, "A Deep awareness of the suffering of another coupled with the wish to relieve it."