Validity Validity is thus entirely about the structure of an argument. The following argument is valid. All men are mortal. Socrates is a man. Therefore, Socrates is mortal This argument is also valid.
All cows are purple.
Bessy is a cow. Therefore, Bessy is purple. Remember, a sound argument is a valid argument in which the premises are also true. Proofs for God's existence Proofs for the existence of God then are demonstrations, based on certain assumptions which are taken to be true, that belief in the existence of God is warranted. One can offer a critique based on either the assumptions or the inferences.