The most manifest sign of wisdom is continued cheerfulness.

The plainest sign of wisdom is a continual cheerfulness: her state is like that of things in the regions above the moon, always clear and serene

Stupidity and wisdom meet in the same centre of sentiment and resolution, in the suffering of human accidents.

It is a disaster that wisdom forbids you to be satisfied with yourself and always sends you away dissatisfied and fearful, whereas stubbornness and foolhardiness fill their hosts with joy and assurance.

We can be knowledgable with other men's knowledge but we cannot be wise with other men's wisdom.

Learned we may be with another man's learning: we can only be wise with wisdom of our own.