Insanity destroys reason, but not wit.
Sanity is a madness put to good use.
Insanity is doing the same thing, over and over again, but expecting different results.
The statistics on sanity are that one out of every four people is suffering from a mental illness. Look at your 3 best friends. If they're ok, then it's you.
Insanity is just what we call stupidity when it doesn't make sense.
Sanity calms, but madness is more interesting.
Insanity is often the logic of an accurate mind overtasked. Good mental machinery ought to break its own wheels and levers, if anything is thrust among them suddenly which tends to stop them or reverse their motion. A weak mind does not accumulate force enough to hurt itself; stupidity often saves a man from going mad.
The knowing, I told myself, is only a vapor of the mind, and yet it can wreck havok with one's sanity.
Love, n - A temporary insanity curable by marriage.