Man says "Show me and I will trust you"
God says "Trust me and I'll show you"
God has made it possible for us to know Him. When you know a friend you trust them. Knowing God means trusting Him. The comment "Show me and I will trust you" indicates a lack of knowledge of God and a desire to control our situation, but God says "Trust me and I'll show you". He wants us to let go of our control and allow God to be in charge.
If we trust God he will show us incredible things, He will do amazing things for us and with us, He will trust us with wonderful gifts, His gifts.
Therefore submit yourselves to God (James 4:7) and Trust Him.