Michel De Montaigne 
The Essays of Montaigne: Book the Third [EPUB ebook] 

No man is free from speaking foolish things; but the worst on’t is, when a man labours to play the fool:
‘Nae iste magno conatu magnas nugas dixerit.’
[‘Truly he, with a great effort will shortly say a mighty trifle.’—-Terence, Heaut., act iii., s. 4.]
This does not concern me; mine slip from me with as little care as they are of little value, and ’tis the better for them. I would presently part with them for what they are worth, and neither buy nor sell them, but as they weigh. I speak on paper, as I do to the first person I meet; and that this is true, observe what follows.