The commonest weakness of our race is our ability to rationalize our most selfish purposes.

There is one weakness in people for which there is no remedy. It is the universal weakness of LACK OF AMBITION!

It is a common failing of mortals to deem the more difficult the fairer.

Upon reflection, I decided I had three main weaknesses: I was confused (evidenced by a lack of facts, an inability to coordinate my thoughts, and an inability to verbalize my ideas); I had a lack of confidence, which cause me to back down from forcefully stated positions; and I was overly emotional at the expense of careful, 'scientific' though. I was thirty-seven years old and still discovering who I was.

"One of the main weaknesses of mankind is the average man's familiarity with the word "impossible." He knows all the rules which will NOT work. He knows all the things which CANNOT be done."

Morality is the weakness of the mind.

We end up populating what we call the intelligentsia with people who are delusional, literally mentally deranged, simply because they never have to pay for the consequences of their actions, repeating moderniest slogans stripped of all depth...The principle of intervention, like that of healers, is first do not harm; even more we will argue, those who don't take risks should never be involved in decision making (p.10).

Their three flaws 1) they think in statics not dynamics 2) they think in low, not high dimensions 3) they think in terms of actions, never interactions....The first flaw is they are incapable in thinking in second steps and unaware of the need of them...The second flaw is that they are also incapable of distinguishing between multidimensional problems and their single dimensional representations. The third flaw is they can't forecast the evolution of those one helps by attaching, or the magnification one gets from feedback. (p.9)

I believe one of the greatest human failings is to prefer to be right than to be effective

Another weakness found in altogether too many people, is the habit of measuring everything, and everyone, by their own impressions and beliefs.

One could argue that the human intellect was the greatest mistake in evolution — a mistake that is now threatening all life on the planet.

My weakness has always been to prefer the large intention of an unskilful artist to the trivial intention of an accomplished one: in other words, I am more interested in the high ideas of a feeble executant than in the high execution of a feeble thinker.

there’s something fundamentally wrong with the wiring of our brains, which makes us incapable of consistent logical thinking. To make matters worse, though all creatures need a certain amount of aggressiveness to survive, we seem to have far more than is absolutely necessary. And no other animal tortures its fellows as we do.

The human race does not have a very good record of intelligent behaviour.

We may insist as often as we like that man's intellect is powerless in comparison to his instinctual life, and we may be right in this. Nevertheless, there is something peculiar about this weakness. The voice of the intellect is a soft one, but it will not rest until it has gained a hearing. Finally, after a countless succession of rebuffs, it succeeds.