The mind itself is the medium of all knowledge, and the quality of that knowledge depends upon the quality of the mind. A dull mind will produce dull knowledge; a penetrating mind will penetrate to the heart of things.
You might also like
We are beginning to see that to ask what is the use of science is as vulgar as to ask what is the use of a sunset, and almost as stupid.
John Desmond Bernal — The Social Function of Science
Expert means you have certification, you've done the diligence, you have the domain expertise, and perhaps you've devoted your life to not only trying to, okay, it's arrogant to say they have the right answers, but they have the least wrong answers of anyone because they devoted their life to understand the [ __ ]
Pivot
It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to wade into its waters.
Friedrich Nietzsche — Thus Spoke Zarathustra