It was said in a sermon that it is selfish to work for wages or from a perspective of what can you get out of it. Would the homilist prefer we otherwise not work at all? Where do they think the money slipped into the collection plate otherwise comes from? Selfish ambition would be more using immoral means to acquire what one desires or to somehow cheat the individual with whom has entered into a contractual arrangement thought to be mutually beneficial to the involved parties.