We can say we believe, but we only fully do, if we have the faith to prove it. If we have too much doubt or fear to act on our belief, we do not truly believe.
Prove Your Faith With Action: It’s More Than Belief
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I Need Proof: The Testimony of God
Is it hard to believe in a God you can’t see? We can’t see the air, but when the wind blows we see it’s effect. So it is with God. His evidence is all around us