The wealth of the universe is all over your head. We need to take command of the solar system to gain that wealth, and to escape the sea of paper our… - Larry Niven

Any citizen, with the help of the organ banks, can live as long as it takes his central nervous system to wear out. This can be a very long time if his circulatory system is kept functioning.
But the citizen cannot take more out of the organ banks than goes into them. He must do his utmost to see that they are supplied.
The only feasible method of supplying the organ banks is through execution of criminals.…
A criminal's pirated body can save a dozen lives. There is now no valid argument against capital punishment for any given crime; for all such argument seeks to prove that killing a man does society no good. Hence the citizen, who wants to live as long and as healthily as possible, will vote any crime into a capital crime if the organ banks are short of material.
Cite Earth's capital punishment for false advertising, income tax evasion, air pollution, having children without a license.
The wonder was that it had taken so long to pass these laws.

Forget the infinities: Concentrate on detail.

"1. a.Never throw shit at an armed man.
b.Never stand next to someone who
is throwing shit at an armed man.

2.Never fire a laser at a mirror.
3.Mother Nature doesn't care if you're having fun.
4.F × S = k. The product of Freedom and Security is a constant. To gain more freedom of thought and/or action, you must give up some security, and vice versa.
5.Psi and/or magical powers, if real, are nearly useless.
6.It is easier to destroy than create.
7.Any damn fool can predict the past.
8.History never repeats itself.
9.Ethics change with technology.
10.There Ain't No Justice. (often abbreviated to TANJ)
11.Anarchy is the least stable of social structures. It falls apart at a touch.
12.There is a time and place for tact. And there are times when tact is entirely misplaced.
13.The ways of being human are bounded but infinite.
14.The world's dullest subjects, in order:
a.Somebody else's diet.
b.How to make money for a worthy cause.
c.The Kardashians.

15.The only universal message in science fiction: There exist minds that think as well as you do, but differently.
Niven's corollary: The gene-tampered turkey you're talking to isn't necessarily one of them.
16.Fuzzy Pink Niven's Law: Never waste calories.
17.There is no cause so right that one cannot find a fool following it.
in variant form in Fallen Angels as "Niven's Law: No cause is so noble that it won't attract fuggheads."
18.No technique works if it isn't used.
19.Not responsible for advice not taken.
20.Old age is not for sissies."