William Shakespeare on Carefulness

“O polished perturbation! golden care! That keep'st the ports of slumber open wide To many a watchful night!”

“No, no, he cannot long hold out these pangs; The incessant care and labour of his mind Hath wrought the mure, that should confine it in, So thin that life looks through and will break out.”

“Care keeps his watch in every old man's eye, And where care lodges, sleep will never lie; But where unbruised youth with unstuff'd brain. Doth couch his limbs, there golden sleep doth reign.”