Here is the lesson about weakness and hipocracy, using quotes:
Colonel Walter E. Kurtz: I watched a snail crawl along the edge of a straight razor. That's my dream. That's my nightmare. Crawling, swiftly, along the edge of a straight... razor... and surviving
Freelance Photographer: One through nine, no maybes, no supposes, no fractions. You can't travel in space, you can't go out into space, you know, without, like, you know, uh, with fractions - what are you going to land on - one-quarter, three-eighths? What are you going to do when you go from here to Venus or something? That's dialectic physics.
Colonel Walter E. Kurtz: We train young men to drop fire on people. But their commanders won't allow them to write "fuck" on their airplanes because it's obscene!
Captain Benjamin L. Willard: No wonder Kurtz put a weed up Command's ass. The war was being run by a bunch of four star clowns who were gonna end up giving the whole circus away.
Colonel Walter E. Kurtz: It's impossible for words to describe what is necessary to those who do not know what horror means. Horror. Horror has a face, and you must make a friend of horror. Horror and moral terror are your friends. If they are not, then they are enemies to be feared. They are truly enemies.
Captain Benjamin L. Willard: It's a way we had over here with living with ourselves. We cut 'em in half with a machine gun and give'em a Band-Aid. It was a lie. And the more I saw them, the more I hated lies.
Kurtz: We must kill them. We must incinerate them. Pig after pig. Cow after cow. Village after village. Army after army.
Freelance Photographer: What are they gonna say about him? What are they gonna say? That he was a wise man? That he was a kind man? That he had plans? That he had wisdom? Bullshit man!
Col. Kurtz: What do you call assassins who accuse assassins?
A more comprehensive list of random quotes from the movie is here.
Kurtz: I've seen the horror. Horrors that you've seen. But you have no right to call me a murderer. You have no right to call me a murderer. You have a right to kill me. You have a right to do that, but you have no right to judge me . It's impossible for words to describe what is necessary to those who do not know what horror means. Horror. Horror has a face, and you must make a friend of horror. Horror and mortal terror are your friends. If they are not, then they are enemies t o be feared. They are truly enemies.
I remember when I was with Special Forces--it seems a thousand centuries ago--we went into a camp to inoculate it. The children. We left the camp after we had inoculated the children for polio, and this old man came running after us, and he was crying. He couldn't see. We went there, and they had come and hacked off every inoculated arm. There they were in a pile--a pile of little arms. And I remember...I...I...I cried, I wept like some grandmother. I wanted to tear my teeth out, I didn't know what I wanted to do. And I want to remember it, I never want to forget. And then I realized--like I was shot...like I was shot with a diamond...a diamond bullet right through my forehead. And I thought, "My God, the genius of that, the genius, the will to do that." Perfect, genuine, complete, crystalline, pure. And then I realized they could stand that--these were not monsters, these were men, trained contras, these men who fought with their hearts, who have families, who have children, who are filled wi th love--that they had this strength, the strength to do that. If I had ten divisions of those men, then our troubles here would be over very quickly. You have to have men who are moral and at the same time were able to utilize their primordial i nstincts to kill without feeling, without passion, without judgment--without judgment. Because it's judgment that defeats us.
I worry that my son might not understand what I've tried to be, and if I were to be killed, Willard, I would want someone to go to my home and tell my son everything. Everything I did, everything you saw, because there's nothing that I detest more than t he stench of lies. And if you understand me, Willard, you...you will do this for me.