This quote by Friedrich Nietzsche recommends that lying is an intrinsic part of human existence which it is essential for survival in particular situations. It might also imply that the reality is not constantly available or desirable which lies can be a method of managing hard situations or securing oneself. Furthermore, the quote might be analyzed as a criticism of social norms and expectations that prioritize sincerity over other worths such as self-preservation or self-expression.
"Life is life - whether in a cat, or dog or man. There is no difference there between a cat or a man. The idea of difference is a human conception for man's own advantage"