That thou mightest know the certainty of those things, wherein thou hast been instructed.
Ver. 4. Wherein thou hast been instructed] Which thou hast received by hearsay, or by word of mouth; and wherein thou hast been catechised, receiving the mysteries of the faith by the ministry of the voice, κατηχηθης. And surely when we see men caring and casting how to find out this certainty here spoken of, and not be led by conjectural, suppositions, but be fully persuaded as St Luke was, and would have his Theophilus to be, then there will be some hopes that the Lord's party will increase.