There are no walls at the edge of this universe...absence of gravity is the limit of space existence.

Smartass Disciple: Master, where is exactly the edge of this universe ?Master of Stupidity: Edge is wherever the absence of universal gravity.

Just because yet unable to comprehend the real form of the edge, doesn't mean that this universe is infinite.

Nothing can be inside an edgeless universe.

Smartass Disciple: Master, tell me what is it beyond this universe ?Master of Stupidity: No 'space' in no 'gravity'. No 'thing' in spaceless.

Mind needs more than 3D perception to be able to see edge of the universe.