Quo magis in dubiis hominem spectare periclis
convenit adversisque in rebus noscere qui sit;
nam verae voces tum demum pectore ab imo
eliciuntur et eripitur persona, manet res.
So it is more useful to watch a man in times of peril, and in adversity to discern what kind of man he is; for then at last words of truth are drawn from the depths of his heart, and the mask is torn off, reality remains.
Lucretius – De Rerum Natura