Hello all!
   I have been looking for years for a song we sang in high school choir. It is similar to those you mention but not quite. The chorus went

I shall pass this way but once.
And if there's any good that I can do
Let me do it now
For I'll never pass this way again.

Tomorrow may be too late my friend
To do all the good that we planned
So reach out to those that need you
And give them a helping hand

Does anyone recognize this version? I would love to get a copy of the music! This song has been in my head for many, many years. Thanks!