Some men never seem to grow old. Always active in thought, always ready to adopt new ideas, they are never chargeable with foggyism. Satisfied, yet ever dissatisfied, settled, yet ever unsettled, they always enjoy the best of what is, are the first to find the best of what will be.
William ShakespeareMerciful heaven, Thou rather with thy sharp and sulphurous bolt Splits the unwedgeable and gnarled oak Than the soft myrtle; but man, proud man, Dressed in a little brief authority, Most ignorant of what he's most assured His glassy essence--like an angry ape Plays such fantastic tricks before high heaven As makes the angels weep; who, with our spleens, would all themselves laugh mortal.
William Shakespeare