Looking in vain for a song- know some lyrics, but can not come up with title or artist- from 60's, folky (somewhat like the seekers' style)

"we'll see the mountains crumble before we say goodbye, my love and I will be in love eternally, cause that's the way, the way it's meant to be"

Any idea- all of my respected music sources remember the song and tune, but not the artist or title.

THANKS!! ASL