"Seeing is believing. If I can’t
see it, I don’t believe it exists."
We believe in many
things that we can’t see. (See Optical
Illusions tract) Ask a skeptic if he has ever seen
the wind. Has he seen history? Has he ever seen his
brain? We see the effects of the wind, but the wind
is invisible. We have records of history, but it is
by "faith" that we believe certain historical
events happened. Television waves are invisible, but
an antenna and a receiver can detect their presence.
The unregenerate man likewise has a "receiver."
However, the receiver (his spirit) is dead because of
sin (Ephesians 2:1). He needs to be plugged into the
life of God; then he will come alive and be aware of
the invisible spiritual realm.