Certainty (n.) is arrived at only through doubt and results only from experiment.
Certainty (n.) does not lead to discoveries, and neither do security and peace.
Certainty (n.) that is especially positive and categorical usually stifles a slight doubt in the background.
Certainty (n.) belongs only to what is subject to change: every so-called fixed and certain thing is only relative.
Certainty (n.) within one side is necessary, but it is also a protection against the other — and the other in us, starved, makes us hungrier for the one.
Certainty (n.) is what we want without doubts, as we want results without experiments — not seeing that certainties arise only through doubt and results only through experiment.