Krait musing about fingerprints
Source: The Good Guy (2007), Chapter 21, p. 147
“Trust the expert.”
Variant translations:
Trust one who has gone through it.
Believe one who has had experience.
Source: Aeneid (29–19 BC), Book XI, Line 283; cf. "experto crede".
Original
Experto credite.
Help us to complete the source, original and additional information
Virgil 138
Ancient Roman poet -70–-19 BCRelated quotes

Dr. Spock's Baby and Child Care (1945)

“If an expert says it can't be done, get another expert.”
As quoted in Words from the Wise : Over 6,000 of the Smartest Things Ever Said (2007) by Rosemarie Jarski, p. 170

“Clarke's Fourth Law: For every expert there is an equal and opposite expert.”
Profiles of the Future (1999, London: Victor Gollancz) p. 143
On Clarke's Laws

Letter to Robert Bulwer-Lytton, 1st Earl of Lytton (15 June 1877), as quoted in The Oxford Dictionary of Quotations (1999) Elizabeth M. Knowles, p. 642; this has also been published without the word "insipid".
1870s
Context: No lesson seems to be so deeply inculcated by the experience of life as that you should never trust experts. If you believe doctors, nothing is wholesome: if you believe the theologians, nothing is innocent: if you believe the soldiers, nothing is safe. They all require their strong wine diluted by a very large admixture of insipid common sense.

“Experts have
their expert fun
ex cathedra
telling one
just how nothing
can be done.”
Experts
Grooks

Illustrated London News (6 April 1918)
“There are no experts in the systems approach”
Source: 1960s - 1970s, The Systems Approach (1968), p. 232