The instruction we find in books is like fire. We fetch it from our neighbours, kindle it at home, communicate it to others, and it becomes the property of all. – Voltaire

Take, for example, the African jungle, the home of the cheetah. On whom does the cheetah prey? The old, the sick, the wounded, the weak, the very young, but never the strong. Lesson: If you would not be prey, you had better be strong. – G. Gordon Liddy