God sometimes uses signs to demonstrate his glory in creation and to guide his people. He strengthens our faith in him and gives confidence in the purpose to which he has called us. Jesus spoke of signs that would indicate his return and reflect the end of time. I have often asked God for signs to confirm that a particular decision or course of action I took was the right one and have certainly prayed for God to give a 'supernatural' or tangible sign to my unbelieving friends to zap them into believing the reality of God's existence. On many occasions those prayers were answered and my faith strengthened, but on some I didn't get the answer to prayer that I wanted or expected.

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