Nietzsche

Madness was a subjective and relative term according to the German philosopher.

He wrote about madness being found in prayer, love and a personal response towards life. A madhouse or asylum, according to him, was filled with people who were not really mad, but just like himself, ...

... for what happens to you. It’s tempting to blame your problems on some external factor, but to fix your problems you must have power over them. You can’t have power over aspects of your life unless you take responsibility for them. 

Nietzsche believed successful marriages are possible when there is a good amount of existing friendship.

According to him, a woman's love has a built-in hatred towards that which is not loved, and both love and hate come together as a package.