Definition.com
Proof is but a fallacy invented by man to justify to himself and his fellows his own crass lust and folly.
Definition.com
Proof is not required to attack any argument that was not supported by proof. That which can be asserted without proof can be dismissed without proof.
Definition.com
Proof is not something which needs to be approached rationally, but rather, proof collapses as soon as enough light is shed on what an assertion says.
Definition.com
Proof is evidence having a shade more of plausibility than of unlikelihood. The testimony of two credible witnesses as opposed to that of only one.
Definition.com
The Proof is a simple mechanism operating on one law only. If the thinker, for example, thinks that all jews are rich, the prover will prove it.