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[Proxima]

Having buddha-nature:

BUDDHANATURE
NATURALSCIENCES
BUD
BUDWEISER
BUDDHIST

Lacking buddha-nature:

NUT
RHAPSODY
DUB
HCL

[NaOH]

AIRBUD

[Simon]

DUBLIN
DUBBERNATURE
NUDE
BUT
HCLACID

[Proxima]

Having buddha-nature:

AIRBUD
DUBLIN
DUBBERNATURE
BUT

Lacking buddha-nature:

NUDE
HCLACID

[Simon]

NATURAL
NURTURE
NURTURED
NUTRIENT

Everything I was considering so far is thrown overboard again by NATURE being black...

-- Simon

[Timballisto]

STATICUS

[Minim]

I
DONT
GET
THIS
ITS
TOTALLY
MISUNDERSTANDABLE

[Proxima]

Having buddha-nature:

DONT
MISUNDERSTANDABLE

Lacking buddha-nature:

NATURAL
NURTURE
NURTURED
NUTRIENT
STATICUS
I
GET
THIS
ITS
TOTALLY

[mobius]

BUDDHABUDDHA
AHDDUB
BUDDXD
BUDDAHS
IO
IOIO
CALL
KLPX
KLPXOIUE
ORANGE
JUICE

------

throwing out an accusation which is most-likely wrong; a koan has the Buddha-nature if it contains letters that are present in "BUDDHA" but must be in the order of which they appear in BUDDHA.

[Proxima]

Having buddha-nature:

BUDDHABUDDHA
AHDDUB (this disproves your guess)
BUDDXD
BUDDAHS
CALL

Lacking buddha-nature:

IO
IOIO
KLPX
KLPXOIUE
ORANGE
JUICE

[ccexplore]

TNOD
TUB
STI
SIHT

[mobius]

BUDDHABUDDHABUDDHABUDDHA
BETTER
BUTTER
CALLLL
HADUBD
BUDE
NUTCRACKER

[Proxima]

Having buddha-nature:

BUDDHABUDDHABUDDHABUDDHA (and in fact any koan consisting of n repetitions of "BUDDHA" )
BETTER
BUTTER
CALLLL
BUDE

Lacking buddha-nature:

TNOD
TUB
STI
SIHT
HADUBD
NUTCRACKER

[Simon]

let the funcion id() turn letters into numbers: id(A) = 1, id(B) = 2, ..., id(Z) = 26.

AKHTBN iff the length of the koan is >= id(first letter of the koan).

-- Simon

[Proxima]

Thou hast attained enlightenment