The previous famous quotes may have many similar, identical or similar views because they involve different topics and ideas. Here are some possible similar or opposite views:

Similar or identical views:

1. "Man is a rational animal." - Aristotle

This view is similar to "rationality is the essence of human beings", both emphasizing that humans have the ability to be rational and think.

2. "Existence is rationality." - Hegel

This view is similar to "all existing things have their rationality and reasons". They both believe that all existing things have their own rationality and reasons. There is a reason and a reason for its existence.

3. "We cannot step into the same river twice." - Heraclitus

This point of view is similar to "Everything flows, nothing remains", both emphasize Philosophical ideas of change and flow.

Similar views:

1. "Everything is connected." - Spinoza

This view is consistent with "Everything that exists has its own connection." "Interrelationship" is similar, both believe that there is some form of connection between things.

2. "Man is free, but is always subject to fate." - Plato

This view is similar to "Humans have free will, but are still limited by fate." Both believe that humans have free will, but are still subject to certain limitations.

Opposite views:

1. "Humans are rational animals, but they also have irrational behaviors." - Darwin

This view is consistent with "Humans are rational animals." Rational animals" on the contrary, believe that humans have irrational behaviors in addition to rationality.

2. "Existence is absurd." - Camus

This view is contrary to "all existing things have their rationality and reasons". It believes that existing things do not have their own reasons. The raison d'être, the reason for existence, is absurd.