Hoyt & Roberts, comps. Hoyt’s New Cyclopedia of Practical Quotations. 1922.
Uncertainty
Quis scit, an adjiciant hodiernæ crastina summæ
Tempora di superi?
Who knows whether the gods will add to-morrow to the present hour?
Horace—Carmina. IV. 7. 17.
Omnia sunt hominum tenui pendentia filo:
Et subito casu, quæ valuere, ruunt.
All human things hang on a slender thread: the strongest fall with a sudden crash.
Ovid—Epistolæ Ex Ponto. IV. 3. 35.
Nothing is but what is not.
Macbeth. Act I. Sc. 3. L. 141.
This
I ever held worse than all certitude,
To know not what the worst ahead might be.
Swinburne—Marino Faliero. Act V.
Dum in dubio est animus, paulo momento huc illuc impellitur.
When the mind is in a state of uncertainty the smallest impulse directs it to either side.
Terrence—Andria. I. 5. 32.