The drive for power is even less logical than the sex urge . . . and stronger. - Robert A. Heinlein

When it comes down to it, the root cause of war is always population pressure no matter what other factors enter in.

Men are expendable; women and children are not. A tribe or a nation can lose a high percentage of its men and still pick up the pieces and go on ... as long as the women and children are saved. But if you fail to save the women and children, you've had it, you're done, you're through! You join Tyrannosaurus Rex, one more breed that bilged its final test.

I’m going to put it to you straight. Never mind about being chief engineer of a planet; these days even a farmer needs the best education he can get. Without it he’s just a country bumpkin, a stumbling peasant, poking seeds into the ground and hoping a miracle will make them grow.