The most dangerous things are heroin and a monthly salary

The most dangerous thing you can do is to take any one impulse of your own nature and set it up as the thing you ought to follow at all costs. There is not one of them which will not make us into devils if we set it up as an absolute guide. You might think love of humanity in general was safe, but it is not. If you leave out justice you will find yourself breaking agreements and faking evidence in trials "for the sake of humanity", and become in the end a cruel and treacherous man.

Nothing is more dangerous than an idea when it is the only one you have.

"Dangerous" does not mean exciting or bold; it means likely to cause great harm. The most dangerous idea is the only dangerous idea: The idea that ideas can be dangerous.

The only thing more dangerous than an idea is a belief. And by dangerous I don't mean thought-provoking. I mean: might get people killed.

The most dangerous items on your to-do list are the ones that look like opportunities, but are actually distractions.

"The most dangerous things are heroin, and a monthly salary." Right, because they are highly addictive.

Knowledge is dangerous.

Love is the most dangerous thing in the world.

Nothing is more dangerous than an idea, when you have only one idea.

The saying that a little knowledge is a dangerous thing is, to my mind, a very dangerous adage. If knowledge is real and genuine, I do not believe that it is other than a very valuable possession, however infinitesimal its quantity may be. Indeed, if a little knowledge is dangerous, where is the man who has so much as to be out of danger?

The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea.

The most dangerous thing that can happen to the smartest person in the world is to start to believe that they are the smartest person in the world.

From this perspective, the common experience of the fading of romance over time may have less to do with the inevitable undercutting of idealization by reality and familiarity than with the increasing danger of allowing oneself episodic, passionate idealization in a relationship that one depends on for security and predictability. Intense excitement about another is a dangerous business; it often is much safer to surrender to it with a person one cannot possibly spend much time with or will never see again. Sustaining desire for something important from someone important is the central danger of emotional life. What is so dangerous about desiring someone you have is that you can lose him or her. Desire for someone unknown and unobtainable operates as a defense against desire for someone known and obtainable, therefore capable of being lost.