GRammar USAGE: should i use "that" or when"?

Question

"it is only through a meaningful self-reflection when(THAT?) one truly achieves personal growth"
does this sentence sound right?

Answer 1

"that" is correct.

However, I would say:
Only through meaningful self-reflection does one achieve true personal growth.

Answer 2

I would say, "It is only through meaningful self-reflection that one truly achieves personal growth."

Or it might be even stronger to turn it around and delete unnecessary words:

Personal growth is only achieved through self-reflection.

If this or any other answer to your question helps you resolve this issue, please select a "best answer." This motivates people to help you and rewards their research in your behalf.

Cheers,
Bruce

Answer 3

"when" is right.