Often it is the scientist, pretended or real, which demands physical evidence for spiritual realities. Yet the scientist believes in many things which he cannot see. A scientist cannot see a magnetic field but he can see the effects of one. A scientist cannot see ionizing radiation, but he can see the radiation burns. A scientist cannot see subatomic particles, but he will argue from here to eternity that they exist. Thus we see that even the atheist-scientist has faith, for faith is things which are hoped for and not seen (Ether 12:6). Why is it so hard for the same individual to believe in a Supreme Being? Just like the magnetic fields, radiation fields, subatomic particles and gravity itself, God is not visible to the naked eye but the effects of His reality are all around us.