Men of profound sadness betray themselves when they are happy: they have a way of embracing happiness as if they wanted to crush and suffocate it, from jealousy: alas, they know only too well that it will flee. Beyond Good and Evil

Fear is a distorting mirror in which anything can appear as a caricature of itself, stretched to terrible proportions; once inflamed, the imagination pursues the craziest and most unlikely possibilities. What is most absurd suddenly seems the most probable. The Post Office Girl 

You would say... inexperienced as I am, and ready to start, as the proverb says, at my own shadow, I cannot afford to give up the sure ground of principle. ...and when you are further required to give an explanation of this principle, you would go on to assume a higher principle, and the best of the higher ones, until you found a resting place; but you would not refuse the principle and consequences in your reasoning like the Eristics—at least if you wanted to discover real existence. The Trials Of Socrates

You should be far more concerned with your current trajectory than with your current results. Atomic Habits