13 years ago I wrote about how "Having pride is key to quality" and this was written in the context of the software services industry. But having worked since then mostly in the services industry, I have come to realize more and more that one needs to have "heart" in their work to give their best.
What do I mean by putting your heart in what you do? It essentially means you care. You care about how the service is delivered, you care about the quality of the service, the timeliness of the delivery, you care about the happiness of the customer.
When one cares, automatically every detail is addressed. This ensures a high quality of delivery, the customer experience is great and you end up with a happy customer.
Happy customers end up giving you more business.
Putting ones heart in what they do, has to come from within each one. It cannot be thrust upon or commanded. So find the job that you want to put your "heart" into what you do and excel at what you do.