Ninety-nine percent of pilots that go up never have engine failure and the 1 percent that do usually land it. But if you're up in the air and something goes wrong you pull that parachute and the whole plane goes down slowly.
The sum of the whole is plainly this: The nature of man considered in his single capacity and with respect only to the present world is adapted and leads him to attain the greatest happiness he can for himself in the present world.