I believe it is an established maxim in morals that he who makes an assertion without knowing whether it is true or false, is guilty of falsehood; and the accidental truth of the assertion, does not justify or excuse him.
Use truth as your anvil, nonviolence as your hammer and anything that does not stand the test when it is brought to the anvil of truth and hammered with nonviolence, reject it.
It is the mark of an educated mind to rest satisfied with the degree of precision which the nature of the subject admits and not to seek exactness where only an approximation is possible.
How can they know
Truth flourishes where the student's lamp has shone,
And there alone, that have no solitude?
So the crowd come they care not what may come.
They have loud music, hope every day renewed
And heartier loves; that lamp is from the tomb.