Only fools say “nothing is impossible.” There are very good reasons why some things are impossible.
Some things are impossible because of a definition.
A triangle with four sides is impossible because the very definition of a triangle is a figure with three sides.
Some things are impossible because of a logic. For example, an irresistible force and an immovable object cannot logically exist in the same universe.
Some things are impossible because of a causal paradox. The most famous example is going back in time and killing your grandfather before your father was conceived.
In short, there are plenty of things that are impossible.
The Wolf