They know too many things they should not know and they do not know some things they need to know.

We live in a world saturated with information. We have virtually unlimited amounts of data at our fingertips at all times, and we’re well versed in the arguments about the dangers of not knowing enough and not doing our homework. But what I have sensed is an enormous frustration with the unexpected costs of knowing too much, of being inundated with information. We have come to confuse information with understanding.

You already know what you know, after all — and, unless your life is perfect, what you know is not enough. You remain threatened by disease, and self-deception, and unhappiness, and malevolence, and betrayal, and corruption, and pain, and limitation. You are subject to all these things, in the final analysis, because you are just too ignorant to protect yourself. If you just knew enough, you could be healthier and more honest. You would suffer less. You could recognize, resist and even triumph over malevolence and evil. You would neither betray a friend, nor deal falsely and deceitfully in business, politics or love. However, your current knowledge has neither made you perfect nor kept you safe. So, it is insufficient, by definition — radically, fatally insufficient.

I know a little bit about a great many things and not enough about any one to make a living in these times.

You know more than you think you know, just as you know less than you want to know.

...The more I learned the more I realized how very much one has to know before one is in-the-know at all.

You read too much and understand too little.

The more I learn, the more I realize how much I don't know.

The more I see - the more I know,
The more I know, the less I understand.

The trouble with the world is not that people know too little; it's that they know so many things that just aren't so.

Too much study and not enough doing creates a paucity of knowledge, a shelter of naïveté, no matter how smart you are.

The biographer's problem is that he never knows enough. The autobiographer's problem is that he knows too much.

We know too much to command ourselves very far.

Too many facts are often as much of an obstacle to understanding as too few. There is a sense in which we moderns are inundated with facts to the detriment of understanding.