Two Phrases I think need to be in Klingon

[Gandralf]

Hi,

I apologize if this question has been asked in the forum before, but I
wanted to ask if anyone can help me with the following:

I would like to make myself a work-out T-shirt with the phrases "Pain is
just weakness leaving the body" and with Nietsche's quote "What does not
kill us, just makes us stronger". Thinking about it, the proper language to
write these phrases in is surely Klingon!

I did find "No pain, no gain - 'oy'be'lu'chugh Qapbe'lu'. " but not the
other ones.

Can anybody help me with working out the Klingon way?

Gandralf

[ter'eS]

I'll give it a try...

"Pain is just weakness leaving the body"

This one is kind of tough as it stands (no noun for 'weakness', for example).  I sometimes like to approach these things from
a slightly different direction.  How about

porghDaq narghDI' 'oy', HoS poch 'When pain appears in the body, it plants strength.'

porgh body
-Daq into
nargh appear
HoS strength
poch

Not exactly the same, but maybe close in spirit.

"What does not kill us, just makes us stronger".

muHoHbe'chugh vaj muHoSmoH 'If it does not kill me, it makes me strong'

mu- 'it-me' prefix
HoH 'kill'
-be' not
-chugh if
vaj then (usually paired with -chugh
HoS strong
-moH cause to be(come)

There's no way except through context to get the idea of 'strongER'.  I also left the subject (whatever 'it' is) unstated, because
I like the effect, and because trying to render 'that which does not...' would involve relative clauses that would be hard to
parse and would lack the Klingony directness of this version.

-- ter'eS