What does this mean to you?

I've read this scripture, and ones like it, on numerous occasions, but it seems to be bypassed quite often. I came across it again in church a week or so ago and it once again caught my attention. I don't want to write any opinion on the subject, I just want to hear what most think it means.

From Doctrine & Covenants 59:

"15 And inasmuch as ye do these things with thanksgiving, with cheerful hearts and countenances, not with much laughter, for this is a sin, but with a glad heart and a cheerful countenance-"

Please discuss