Have you seen God ?

A college student was in a philosophy class, where there was a class discussion about whether or not God exists, The professor had the following logic:

"Has anyone in this class heard God?" Nobody spoke.

"Has anyone in this class touched God?" Again, nobody spoke.

"Has anyone in this class seen God?" When nobody spoke for the third time, he simply stated, "Then there is no God."

The student did not like the sound of this at all, and asked for permission to speak. The professor granted it, and the student stood up and asked the following questions of his classmates:

"Has anyone in this class heard our professor's brain?" Silence.

"Has anyone in this class touched our professor's brain?" Absolute silence.

"Has anyone in this class seen our professor's brain?" When nobody in the class dared to speak, the student concluded, "Then, according to our professor's logic, it must be true that our professor has no brain!"

The student received an "A" in the class.