'Convince' in the Bible

“Ask a sign for yourself from the Lord your God [one that will convince you that God has spoken and will keep His word]; make your request as deep as Sheol or as high as heaven.”

Do you [who worship idols] not know? Have you not heard?Has it not been told to you from the beginning?Have you not understood from the foundations of the earth [the omnipotence of God and the stupidity of bowing to idols]?