As there is a use in medicine for poisons, so the world cannot move without rogues.
There is no place so dangerous as a world without magic.
All your problems are just illusions that will pass without a trace.
Great literature, past or present, is the expression of great knowledge of the human heart; great art is the expression of a solution of the conflict between the demands of the world without and that within…
In a world that changes at an exponential rate, members of such world community have to be very proficient in finding reasonable solutions to the problems that they face by themselves.
[Knowing how to suffer without complaining is the only practical thing, it's the great science, the lesson to learn, the solution to the problem of life. ]
A world without love would be no world.
A world without delight and without affection is a world destitute of value.
The world does so well without me, that I am moved to wish that I could do equally well without the world.
The problem of establishing a perfect civic constitution is dependent upon the problem of a lawful external relation among states and cannot be solved without a solution of the latter problem.