How do we know God is all-knowing?

The omniscience of God is a central tenet of Scripture. In John 6, Jesus demonstrated His all-knowing nature by understanding not only the practical need to feed the hungry multitude but also the identities and conditions of everyone present. Verse 6 states that He asked Philip to test him, 'for He Himself knew what He would do.' This indicates that nothing is outside of God's knowledge—He perceives all things, past, present, and future. Such understanding should lead believers to trust in His plans, knowing that He is aware of their every need and circumstance.