Perfectionism is simply putting a limit on your future. When you have an idea of perfect in your mind, you open the door to constantly comparing what you have now with what you want. That type of self criticism is significantly deterring. - John Eliot, Ph.D.
One had to cram all this stuff into one's mind for the examinations, whether one liked it or not. This coercion had such a deterring effect on me that, after I had passed the final examination, I found the consideration of any scientific problems distasteful to me for an entire year. - Albert Einstein
In every era, humanity produces demonic individuals and seductive ideas of repression. The task of statesmanship is to prevent their rise to power and sustain an international order capable of deterring them if they do achieve it. - Henry Kissinger