I have often tried to say to you personally what I am about to write, but was prevented by a kind of almost clownish bashfulness. Now that I am not in your presence I shall speak out more boldly: a letter does not blush.

[Coram me tecum eadem haec agere saepe conantem deterruit pudor quidam paene subrusticus, quae nunc expromam absens audacius; epistula enim non erubescit.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Epistulae ad Familiares [Letters to Friends], Book 5, Letter 12, sec. 1 (5.12.1), to Lucius Lucceius (55 BC) [tr. Shuckburgh (1899), # 108]
    (Source)

Opening lines of the letter. Cicero then brazenly asks Lucceius, an orator and literary figure, to prominently mention Cicero's consulship in the history he is writing, as had been promised -- and if, as a friend, Lucceius embellished things, well, that was fine with Cicero, too.

(Source (Latin)). Alternate translation:

I Determine freely, to open my minde unto you by letters, which doe not blush; seeing in presence I never durst doe it, through a certaine modesty, I cannot say, but rather a rudenesse.
[tr. Webbe (1620)]

I have frequently had it in my intentions to talk with you upon the subject of this letter; but a certain aukward modesty, has always restrained me from proposing in person, what I can with less scruple request at this distance: for a letter, you know, spares the confusion of a blush.
[tr. Melmoth (1753), 1.20]

A certain sense of shame has often halted me when I have been minded to take up with you face to face the topic which I now will set forth more boldly in your absence; for a letter does not blush.
[tr. McKinlay (1926)]

Often, when I have attempted to discuss this topic with you face to face, I have been deterred by a sort of almost boorish bashfulness; but now that I am away from you I shall bring it all out with greater boldness; for a letter does not blush.
[tr. Williams (Loeb) (1928)]

Although I have more than once attempted to take up my present topic with you face to face, a sort of shyness, almost awkwardness, has held me back. Away from your presence, I shall set it out with less trepidation. A letter has no blushes.
[tr. Shackleton Bailey (1978), # 22]

I have often tried to speak of these matters with you in person, but an almost clownish sense of shyness has scared me off; now, being away from you, I shall declare them more boldly, since a letter does not blush.
[tr. @aleator (2013)]