Found both of these similar sets of lyrics at http://www.namethathymn.com/hymn-lyrics-detective-forum/index.php?a=vtopic&t=155

Neither poster gave their source.

I.

May the work I've done speak for me
when I'm resting in my grave
there is nothing that can be said
may the work I've done speak for me
May the life that I live speak for me
when the best I try to live
my mistakes He will forgive
may the life I live speak for me
may the service I give speak for me
when I've done the best I can
and my friends don't understand
may the service I've given speak for me
all that I've done
the service I have given
and the life I have lived
may all seem small
but when I stand before God
I want to hear him say well done
May the life I've live speak for me

sung by the Consolers the song was also sung by Rufus Washington and the Swanee Quient

II.

This is the full lyrical content for this song:

May the works I've done speak for me
May the works I've done speak for me
When I've done the best I can
and my friends don't understand
May the works i've done speak for me

The works I've done may seem so small
sometimes it seems like, seems like nothing at all
But when I stand before my God
i want to hear him say well done
May the works I've done speak for me

May the life I lived speak for me
may the life I lived speak for me
When I'm resting in my grave
And there's no more that can be said
May the life I live speak for me