The Graybeard saying goes as "Sky Above, Voice within" and that's "Lok, thu'um". The mere mention of the words invoke the meaning, so you can parallel it like this:

Your saying is a modification of that. To put it simply, you would just say "Sky Earth Fire". Since Sky is assumed above and Earth below, they're fine. But Fire isn't assumed within, so you can modify it by adding Tu'um (within).

The final saying is "Lok Gol Yol Tu'um"

Or if you want to put it in two lines, separate

You forgot the y in that second one. Should look like this:

[Lok gol]

[Yol tuum]