To judge

Judge: To form an opinion through careful weighing of evidence and testing of premises; to sit in judgement of, to try; to determine or pronounce after inquiry and deliberation; to govern, rule; to form an estimate or evaluation of; to form an opinion; to decide as a judge. Middle English juggen, from Anglo-French juger, from Latin judicare.

Mediate: Occupying a middle position; acting through an intervening agency; exhibiting indirect causation, connection, or relation. From Late Latin mediatus intermediate.

Fact: A thing done; the quality of being actual; something that has actual existence; an actual occurrence; a piece of information presented as having objective reality. From Latin factum. 

Witness: Attestation of a fact or event; one that gives evidence; specifically: one who testifies in a cause or before a judicial tribunal; one asked to be present at a transaction so as to be able to testify to its having taken place; one who has personal knowledge of something; something serving as evidence or proof; public affirmation by word or example of usually religious faith or conviction. Middle English witnesse, from Old English witnes knowledge, testimony, witness, from wit.

Testimony: The tablets inscribed with the Mosaic law, the ark containing the tablets; a divine decree attested in the Scriptures; firsthand authentication of a fact; a solemn declaration usually made orally by a witness under oath in response to interrogation by a lawyer or authorized public official; an open acknowledgment. Middle English testimonie, Latin testimonium, from testis witness.