“Nothing is more painful to the human mind than, after the feelings have been worked up by a quick succession of events, the dead calmness of inaction and certainty which follows and deprives the soul both of hope and fear.”

“Doubt is nothing but a trivial agitation on the surface of the soul, while deep down there is a calm certainty.”

“Hope is not a feeling of certainty that everything ends well. Hope is just a feeling that life and work have a meaning.”

“Nothing tends to materialize man and to deprive his work of the faintest trace of mind more than the extreme division of labor.”

“Once you have given up the ghost, everything follows with dead certainty, even in the midst of chaos.”

“Calmness of mind does not mean you should stop your activity. Real calmness should be found in activity itself. We say, "It is easy to have calmness in inactivity, it is hard to have calmness in activity, but calmness in activity is true calmness.”

“Better to know the quick pain of truth than the ongoing pain of a long-held false hope.”

“After that, work and hope. But never hope more than you work”

“Ideas which have been developed simultaneously or in immediate succession in the same mind mutually reproduce each other, and do this with greater ease in the direction of the original succession and with a certainty proportional to the frequency with which they were together.”

“Fears are nothing more than a state of mind.”