I have
εἶχον (eichon)
Verb - Imperfect Indicative Active - 1st Person Singular
Strong's Greek 2192: To have, hold, possess. Including an alternate form scheo skheh'-o; a primary verb; to hold.

many things
Πολλὰ (Polla)
Adjective - Accusative Neuter Plural
Strong's Greek 4183: Much, many; often.

to write
γράψαι (grapsai)
Verb - Aorist Infinitive Active
Strong's Greek 1125: A primary verb; to 'grave', especially to write; figuratively, to describe.

you,
σοι (soi)
Personal / Possessive Pronoun - Dative 2nd Person Singular
Strong's Greek 4771: You. The person pronoun of the second person singular; thou.

but
ἀλλ’ (all’)
Conjunction
Strong's Greek 235: But, except, however. Neuter plural of allos; properly, other things, i.e. contrariwise.

I would prefer
θέλω (thelō)
Verb - Present Indicative Active - 1st Person Singular
Strong's Greek 2309: To will, wish, desire, be willing, intend, design.

not
οὐ (ou)
Adverb
Strong's Greek 3756: No, not. Also ouk, and ouch a primary word; the absolute negative adverb; no or not.

[to do so]
γράφειν (graphein)
Verb - Present Infinitive Active
Strong's Greek 1125: A primary verb; to 'grave', especially to write; figuratively, to describe.

with
διὰ (dia)
Preposition
Strong's Greek 1223: A primary preposition denoting the channel of an act; through.

pen
καλάμου (kalamou)
Noun - Genitive Masculine Singular
Strong's Greek 2563: A reed; a reed-pen, reed-staff, measuring rod. Or uncertain affinity; a reed; by implication, a pen.

and
καὶ (kai)
Conjunction
Strong's Greek 2532: And, even, also, namely.

ink.
μέλανος (melanos)
Noun - Genitive Neuter Singular
Strong's Greek 3188: Ink. Neuter of melas as noun; ink.


Additional Translations
I have many things to write you, but I would prefer not to do so with pen and ink.

I had many things to write to you, but I do not desire to write to you with ink and pen;

I had many things to write, but I will not with ink and pen write to you:

I had many things to write unto thee, but I am unwilling to write them to thee with ink and pen:

I had many things to write to thee, but I will not with ink and pen write to thee;

I had many things to write unto thee, but I am unwilling to write them to thee with ink and pen:

I had many things to write, but I will not with ink and pen write to thee:

I have a great deal to say to you, but I do not wish to go on writing it with ink and pen.

I had many things to write to you, but I am unwilling to write to you with ink and pen;

Many things I had to write, but I do not wish through ink and pen to write to thee,Deal Great Ink Pen Purpose Rather Unwilling Want Willing Wish Write WritingDeal Great Ink Pen Purpose Rather Unwilling Want Willing Wish Write Writing3 John 1:13 NIV
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Alphabetical: am and but do had have I ink many much not pen so them things to want willing with write you

NT Letters: 3 John 1:13 I had many things to write (3J iiiJ 3Jn iii jn 3 jo) Bible Study Resources, Dictionary, Concordance and Search Tools