Kiri-kin-tha's First Law of Metaphysics

[Man in Space]

Nothing unreal exists.
nothing unreal exists

nothing

NEG.INDEF

un-

NEG

real

real

exist

exist

-s

3SG.PRES

Stat nihil non ens.
stat nihil non ens

sta

stand

-t

3SG.PRES

nihil

nothing

non

NEG

ens

COP.PTCP

'nothing that is not stands'

غَيْرُ ٱلْوَاقِعِيّ غَيْرُ مَوْجُدٍ
ḡayru l-wāqi‘iyy ḡayru mawjudin

ḡayr

except

-u

NOM.DEF

al-

DEF

wāqi‘iy

real

-i

GEN.DEF

ḡayr

except

-u

NOM.DEF

mawjud

find.PASS.PTCP

-in

GEN.INDEF

'that not real is not found'
(I tried. It's been ages since I last used Arabic much.)



CT: Áge tó da suú ro réa.
áge tó da suú ro réa

áge

COP

tó

TOP

da

thing

suú

true

ro

NEG

réa

nothing.DIST

'there is no unreal thing'

CC: Iec ćoso ŭrcaś ecbo.
iec ćoso ŭrcaś ecbo

iec

there.is.not

ćoso

thing

ec

NEG

-bo

ADV

'there is nothing not real'

[Creyeditor]

Just wanted to share these German Redewendungen, which say the exact opposite.

Sachen gibt's, die gibt's gar nicht.
things exist.3SG.3SG REL.PL exist.3SG.3SG really not
'Things exist, that exist really not.'

Also paraphrased as:

Es gibt nichts, was es nicht gibt!
3SG.N exist.3SG nothing, REL.N 3SG.N not exist.3SG
'Nothing exists, that doesn't exist.'

Which I guess is closer to OP's idea.

[lsd]

3SDL avoids tautologies...
I'd say
h¼©f«f«©{ºK\
(impossible to act on thing experienced by thought alone...)
is not real a thing experienced solely through thought...

[Reyzadren]

griushkoent (without script here)

shurskehen shuryolta.
/'ʃurskəhən 'ʃurjɔlta/
NEG-reality-N-PASS NEG-exist-V

[Man in Space]

Archaic Vye: Utkyénk kryuga vkhphsra.
utkyén-k kryá-vga v=K-phsra

utkyén

nothing

-k

ACC

kryá

essence

-vga

PRIV

v=

NEG

K-

IRR

aphsrá

begin

'let nothing without essence start' (the semantics are a bit weird here; incidentally, also schwa is now e, so it's Archaic Vye now)

Kgáweq’: Tlo’ǫrąłrye’etl’k’okgrátsqgonog.
tlo’-ǫr-ął-rye’etl’-go-kgrátsqgo-ǫg

tlo’-

NEG

ǫr-

3SG.ANIM

ął-

INV

rye’etl’

contradict.reality

go-

CONT.SUBJ

kgrátsqgo

establish

-ǫg

AUG.S.O.

'[a thing] cannot stand in contradiction to reality'

[kiwikami]

Alál

Atìktasǔlı atìsìṭraım.
[˹ɐ˻tektɐso˹ɮi ɐ˻tesetʼrɐjm]
ta<ì-ktv>s-ùl-í ta<ì>s-ìṭ-raı-m
exist<4-0s>-AFF-STAT exist<4>-NEG-NOMPAT-STAT
No nonexistent thing exists.

Translation challenge: 15/100