Alternation of Thing (Unknown)

The story line:
...From a philosophical point of view:
A college student was in a philosophy class which had a discussion about God's existence. The professor presented 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 simple stated, "Then there is no God."

One student thought for a second, and then asked for permission to reply. Curious to hear the bold student's response, 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 comment line:
Like religious paths, one would think there are always more than one way to reach the destination. Multiple paths exist to fit each individual's capability, time, and environment where one was adopted and familiar with.
The email above, received from a co-worker, reminds me one of my Math professors while I was in college years ago.
This particular Math professors always had flexible ways of looking and proving things. One of his favorite styles is that when he wanted to prove a particular number that had a negative value (-), he tended to prove that number in a way that it could never be possitive (+). In other words, once things could not be proven non-negative, then one has to accept the fact that it is a positive one.
The student above on this example, reflects a perfect example of how flexibility and the alternation in life could bring. Once one can't prove something right to argumentative people, one can try to prove that it is impossible to be wrong.