And he is interested in discovering the ground upon which these common affirmations rest, the structure which virtually supports them as types of knowledge.
"The Approach to Philosophy"
Ralph Barton Perry
In 1888 he succeeded in passing an Oaths Bill, making affirmations permissible instead of oaths.
"A Biographical Dictionary of Freethinkers of All Ages and Nations"
Joseph Mazzini Wheeler
This, however, only shows that there is an ambiguity in the word is; a word which not only performs the function of the copula in affirmations, but has also a meaning of its own, in virtue of which it may itself be made the predicate of a proposition.
"A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2)"
John Stuart Mill