Time puts an end to speculation in opinions, and confirms the laws of nature.
Sound conviction should influence us rather than public opinion.
Not in opinion but in nature is law founded.
No liberal man would impute a charge of unsteadiness to another for having changed his opinion.
Nihil est incertius vulgo, nihil obscurius voluntate hominum, nihil fallacius ratione tota comitiorum. (Nothing is more unpredictable than the mob, nothing more obscure than public opinion, nothing more deceptive than the whole political system.)
But in every matter the consensus of opinion among all nations is to be regarded as the law of nature.
Grief is not in the nature of things, but in opinion.
The absolute good is not a matter of opinion but of nature.
No well-informed person has declared a change of opinion to be inconstancy.
There is no opinion so stupid that it can't be expressed by some philosopher.
There is no opinion so absurd that some philosopher will not express it
Great is the power, great is the authority of a senate that is unanimous in its opinions.
No wise man has called a change of opinion in constancy.
I have always been of the opinion that unpopularity earned by doing what is right is not unpopularity at all, but glory.