Biconditional (if-and-only-if)
Negation (not)
Truths
Propositions
Limited Scope
Untestability
Bertrand Russell on Christian Ethics
The fundamental defect of Christian ethics consists in the fact that it labels certain classes of acts ‘sins’ and others ‘virtue’ on grounds that have nothing to do with their social consequences.
Dorothy Sayers on Taming Jesus
Official Christianity, of late years, has been having what is known as "a bad press." We are constantly assured that the churches are empty because preachers insist too much upon doctrine — "dull dogma," as people call it. The fact is the precise opposite. It is the neglect of dogma that makes for dullness. The Christian faith is the most exciting drama that ever staggered the imagination of man — and the dogma is the drama… This is the dogma we find so dull — this terrifying drama of which God is the victim and the hero. If this is dull, then what, in Heaven’s name, is worthy to be called exciting? The people who hanged Christ never, to do them justice, accused Him of being a bore — on the contrary; they thought Him too dynamic to be safe. It has been left for later generations to muffle up that shattering personatlity and surround Him with an atmosphere of tedium. We have very efficiently pared the claws of the Lion of Judah, certifying Him "meek and mild," and recommended Him as a fitting household pet for pale curates and pious ladies. To those who knew him, however, he in no way suggested a milk-and-water person; they objected to him as a dangerous firebrand.
Bertrand Russell on Science and Philosophy
Roughly, science is what we know and philosophy is what we don’t know.