I must consider more closely this cycle of good and bad days which I find coursing within myself. Passion, attachment, the urge to action, inventiveness, performance, order all alternate and keep their orbit; cheerfulness, vigor, energy, flexibility and fatigue, serenity as well as desire. Nothing disturbs the cycle for I lead a simple life, but I must still find the time and order in which I rotate.

A life without love, without the presence of the beloved, is nothing but a mere magic-lantern show. We draw out slide after slide, swiftly tiring of each, and pushing it back to make haste for the next.

No doubt you are right... there would be far less suffering amongst mankind if men... did not employ their imaginations so assiduously in recalling the memory of past sorrow, instead of bearing their present lot with equanimity.

Man's restlessness makes him strive.

Just begin and the mind grows heated; continue, and the task will be completed!

Should I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?

He is a man whom it is impossible to please, because he is never pleased with himself.