The slowness of one section of the world about adopting the valuable ideas of another section of it is a curious thing and unaccountable. This form of stupidity is confined to no community, to no nation; it is universal. The fat is the human race is not only slow about borrowing valuable ideas—but sometimes persists in not borrowing them at all.
Samuel Langhorne Clemens, 1835-1910
Indolence and stupidity are first cousins.
'Stupidity' defines the mental state wherein we acknowledge that we've never been smarter as individuals and yet somehow we've never felt stupider. We now collectively inhabit a state of stupidity.
Thus our own age is essentially one of understanding, and on the average, perhaps, more knowledgeable than any former generation, but it is without passion. Every one knows a great deal, we all know which way we ought to go and all the different ways we can go, but nobody is willing to move.
The reason why new concepts in any branch of science are hard to grasp is always the same; contemporary scientists try to picture the new concept in terms of ideas which existed before.
The kings of modern thought are dumb.
The most dangerous enemy to Israel's security is the intellectual inertia of those who are responsible for security.
Progress is slow partly from mere intellectual inertia. In a subject where there is no agreed procedure for knocking out errors, doctrines have a long life. A professor teaches what he was taught, and his pupils, with a proper respect and reverence for teachers, set up a resistance against his critics for no other reason than that it was he whose pupils they were.
The labor of thinking was so great to me, that having once come to a conclusion upon any subject, I would rather persist in it, right or wrong, than be at the trouble of going over the process again to revise and rectify my judgment.
Psychological knowledge has made us dull.
When we are accustomed to use bad reasons for proving natural effects, we are not willing to receive good reasons when they are discovered
The unpreparedness of the educated classes, the lack of practical links between them and the mass of the people, their laziness, and, let it be said, their cowardice at the decisive moment of the struggle will give rise to tragic mishaps.
It's usually easier to rouse stupidity to action than to arouse wisdom to effort, for wisdom sees alternatives while stupidity lacks the imagination to do this. All sinister interests in a country can depend ultimately upon the strength of stupidity.
Finished persons are very common - people who are closed up, quite satisfied that there is little more to learn
We bring forth weeds when our quick minds lie still.
There aren't many such enthusiasts born. The average person is not especially curious about the world. He is alive, and being somehow obliged to deal with this condition, feels the less effort it requires, the better. Whereas learning about the world is labor, and a great all-consuming one at that. Most people develop quite antithetical talents, in fact - to look without seeing, to listen without hearing, mainly to preserve onself within oneself.