The evidence of things unseen.
The hardest part about faith is not seeing. It is a concept that by trusting the words that are spoken by God, who is Elohim (All Mighty), are so sure and true that they take on the same tangible, sensible aspects of hard, physical evidence. To out limited minds and spiritual awareness, anything that is not seen and touchable is difficult to believe. The state of Missouri gained reputation of being the “Show Me” state, because so many of the inhabitants would not believe something unless they saw it. Jesus was quoted in Matthew 12:39 as saying, “An evil and adulterous generation seeks after a sign, …”
A sign: hard, physical evidence