Message of the Matrix

After Morpheus offered Neo the Blue and Red pills, he asked a question that my friend said is one of the most important asked in the history of human existence and meaning:

"What is real? How do you define real? If you're talking about your senses, what you feel, taste, smell, or see, then all you're talking about are electrical signals interpreted by your brain."

Here's Morpheus inviting us to think: is what we believe to be real really all real?