“Exchange unprofitable religious speculations for actual God-contact. Clear your mind of dogmatic theological debris; let in the fresh, healing waters of direct perception.”

Letter to his son, John Quincy Adams (13 November 1816)
1810s
Source: The Letters of John and Abigail Adams

Variant translation: I freely admit: it was David Hume's remark that first, many years ago, interrupted my dogmatic slumber and gave a completely different direction to my enquiries in the field of speculative philosophy.
Prolegomena to Any Future Metaphysics (1783)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 29.

"Lectures on Gas Theory", translated by Stephen George Brush (1971), p. 26

Hank Hanegraaf's "Bible Answer Man" radio program (19 December 2001)
2000s

Hays translation
Suppose that men kill thee, cut thee in pieces, curse thee. What then can these things do to prevent thy mind from remaining pure, wise, sober, just? For instance, if a man should stand by a limpid pure spring, and curse it, the spring never ceases sending up potable water; and if he should cast clay into it or filth, it will speedily disperse them and wash them out, and will not be at all polluted. How then shalt thou possess a perpetual fountain? By forming thyself hourly to freedom conjoined with contentment, simplicity and modesty.
VIII, 51
Meditations (c. 121–180 AD), Book VIII

Canto I, lines 88–90 (tr. Ciardi).
The Divine Comedy (c. 1308–1321), Paradiso

Speaking during his 2014 Colombia Crusade - "TB Joshua Lights Up Colombia, Fills Olympic Stadium" http://bulawayo24.com/index-id-news-sc-religion-byo-50760.html Bulawayo 24, Zimbabwe (July 17 2014)