The best you can do is grant my demand,
Your second-best course to refuse it off-hand;
I welcome assent and denial excuse —
But, Cinna, you neither consent nor refuse.

[Primum est ut praestes, si quid te, Cinna, rogabo;
illud deinde sequens, ut cito, Cinna, neges.
Diligo praestantem; no odi, Cinna, negantem:
sed tu nec praestas nec cito, Cinna, negas.]

Martial (AD c.39-c.103) Spanish Roman poet, satirist, epigrammatist [Marcus Valerius Martialis]

Epigrams [Epigrammata], Book 7, epigram 43 (7.43) (AD 92) [tr. Pott & Wright (1921)]
    (Source)

Source (Latin). Alternate translations:

My iust demands soone graunt or soone deny,
Th' one friendship showes, and th' other curtesie.
But who nor soon doth graunt, nor soone say noe,
Doth not true friendship, nor good manners know.
[tr. Davison (1602)]

The first love, Cinna, is to grant what I
Request; the second quickly to deny.
I love the one, the other hate not I;
But thou nor grant'st, nor quickly dost deny.
[tr. May (1629), 7.42]

The kindest thing of all is to comply;
The next kind thing is quickly to deny:
I love performance; nor denial hate:
Your "Shall I, Shall I?" is the cursed state.
[tr. Hay (1755)]

To grant must doubtless be the primal boon:
The next, my Cinna, to deny me soon.
I love the former, nor the latter hate:
But thou not grantest, and deniest late.
[tr. Elphinston (1782), Book 5, ep. 53]

The greatest favour that you can do me, Cinna, if I ask anything of you, is to give it me; the next, Cinna, to refuse it at once. I love one who gives, Cinna; I do not hate one who refuses; but you, Cinna, neither give nor refuse.
[tr. Bohn's Classical (1859)]

Cinna, grant me my request:
(I warmly hope you'll choose to!)
Or do what I think second best,
In haste refuse to.
Patrons I esteem, nor hate
The man I can't bamboozle:
But you give naught, yet make me wait
A slow refusal.
[tr. Nixon (1911)]

The first thing is that you should hand it over if I ask anything of you, Cinna; the next thing after that, Cinna, is that you should refuse quickly. I like a man who hands over; I do not hate, Cinna, a man who refuses; but you neither hand over, nor do you, Cinna, quickly refuse.
[tr. Ker (1919)]

'Tis best to grant me, Cinna, what I crave;
And next best, Cinna, is refusal straight.
Givers I like: refusal I can brave;
But you don't give -- you only hesitate!
[tr. Duff (1929)]

Cinna, the best thing would be if you lent
Me anything I asked for. The next best
Would be for you to say no then and there.
I like good givers, and I don't resent
A straight refusal of a small request.
It's ditherers like you that I can't bear.
[tr. Michie (1972)]

Best is that you give me anything I ask, Cinna; next best, Cinna, is that you refuse promptly. I like a man who gives; I don't hate a man who refuses, Cinna. But you, Cinna, neither give nor promptly refuse.
[tr. Shackleton Bailey (1993)]

Cinna, to give me what I ask is best;
next best is to refuse without delay.
I love a giver, don't resent refusers.
You neither give nor tell me no straightway.
[tr. McLean (2014)]