It would be D, hope this helps.
<span>the need to always be consistent.
He believe that A greater mind will always follow their intuition rather than listening to the opinion of the lesser intellectuals. He is saying to not be worried about being consistent with a previous idea because in the pursuit of knowledge,mistakes will keep occurring.</span>
It means they are physician fine but mentally they feel down or a feeling of low self esteem or simply being over worked.
