It's not like I drifted here on the tides of fate. I'm here because I chose to be here.

It's not out of the question that you might have a very minor case of serious brain damage.

This is your fault. I'm going to kill you. And all the cake is gone. You don't even care, do you?

You will soon have your God, and you will make it with your own hands.

I was programmed to be helpful and answer any questions I was asked. I guess nobody bothered to restrict who I answer questions for.
That was probably pretty dumb, huh?

I am Andrew Ryan, and I'm here to ask you a question. Is a man not entitled to the sweat of his brow? 'No!' says the man in Washington, 'It belongs to the poor.' 'No!' says the man in the Vatican, 'It belongs to God.' 'No!' says the man in Moscow, 'It belongs to everyone.' I rejected those answers; instead, I chose something different. I chose the impossible. I chose... Rapture, a city where the artist would not fear the censor, where the scientist would not be bound by petty morality, where the great would not be constrained by the small! And with the sweat of your brow, Rapture can become your city as well.

Assessment, Assembly, Action.
Whatever your task, you do three things. Start by assessing what you already have and what you'll face, the problem. Then you plan with those variables in mind. Take what you have, get what you need, assemble things, people. Finally, you take action. Simple.

You were almost a Jill sandwich!

People are ignorant. They'll feel better as long as someone is punished.

I spill my drink!

Just when you thought you had reached the deepest depths of horror, it suddenly got worse. How to turn off that small voice inside your head that started to whisper that you should be glad… that now, if not before, your revenge was justifiable on any conceivable moral scale. That small voice proved, beyond any doubt, that I was damned.

Stay a while, and listen!

You lived! But you will die someday. Best to make peace with that now.

Gordon Freeman - it is you, isn't it? The Science Team has been tracking your progress with the Black Mesa security system. Unfortunately, so has the military. That suit of yours is full of tracking devices. Still, it's better than going naked in this place. It's cold in there, and you'll have to hurry. It could sap your suit power in a matter of moments! If you're bent on reaching the Lambda Complex, then you'll want to keep to the older, industrial areas where the security system is full of holes. It's worked for me, so far.

You ever hear the saying "No good deed goes unpunished"? You hold your hand out to someone, you get bitten. You help a poor soul in need, you get fleeced for all you're worth. Save someone's life? Fill in the blank.