Perpetual optimism is a force multiplier.
Happiness is the perpetual possession of being well deceived.
The honest man must be a perpetual renegade, the life of an honest man a perpetual infidelity. For the man who wishes to remain faithful must take himself perpetually unfaithful to all the continual, successive, indefatigable, renascent errors.
Male and female represent the two sides of the great radical dualism. But in fact they are perpetually passing into one another. Fluid hardens to solid, solid rushes to fluid. There is no wholly masculine man, no purely feminine woman.
A door is what a dog is perpetually on the wrong side of.
The recipe for perpetual ignorance is: be satisfied with your opinions and content with your knowledge.
Progress, far from consisting in change, depends on retentiveness. When change is absolute there remains no being to improve and no direction is set for possible improvement: and when experience is not retained, as among savages, infancy is perpetual. Those who cannot remember the past are condemned to repeat it. In the first stage of life the mind is frivolous and easily distracted, it misses progress by failing in consecutiveness and persistence. This is the condition of children and barbarians, in which instinct has learned nothing from experience.