Idleness and pride tax with a heavier hand than kings and governments.

Let thy discontents be thy secrets

A man must have a good deal of vanity who believes, and a good deal of boldness who affirms, that all the doctrines he holds are true, and all he rejects are false.

...till we are uneasy in Rest, we can have no Desire to move, and without Desire of moving there can be no voluntary Motion.

Can anything be constant in a world which is eternally changing?

Contentment makes a poor person rich and discontent makes a rich person poor.

Perhaps the history of the errors of mankind, all things considered, is more valuable and interesting than that of their discoveries. Truth is uniform and narrow; it constantly exists, and does not seem to require so much an active energy, as a passive aptitude of the soul in order to encounter it. But error is endlessly diversified; it has no reality, but is the pure and simple creation of the mind that invents it. In this field the soul has room enough to expand herself, to display all her boundless faculties, and all her beautiful and interesting extravagancies and absurdities.