This song only has two lines (starting @ 2:24) which are, according to the few online sources I can find:

"So take the light that is yours my friend
Into a dream that will never end"

However I'm not convinced about the accuracy of the first five words.

https://www.youtube.com/watch?v=XcsJzV_Ocr4

Any offers?

Supplementary question: bearing mind it's an early 70s track, what synth / keyboard is being used for the melody?

That's exactly what he's singing. Sounds quite clear to me.