They are pleased to offer their work to Sai, and that is what fills them with Bliss.

DOUBT:
I would like to do Seva but my profession is very demanding in time. I have no time for Seva Dal duty/service. What happens to a person like me? I cannot renounce my salary and work! But I can’t also get away from work because its nature is such. So, what am I to do?

This is a valid doubt. A person may be a doctor, say, and there could be so many demands on his time that he really has no free time of his own to do service in the traditional sense. The doubt is being raised by such a person.