Carefulness is the quality of being attentive to potential danger, error or harm. In countering the potential for error it may refer to being conscientious, painstaking, and meticulous.
For want of a nail the shoe was lost; for want of a shoe the horse was lost; and for want of a horse the rider was lost; being overtaken and slain by the enemy, all for want of care about a horse-shoe nail.
For the want of a nail the shoe was lost, For the want of a shoe the horse was lost, For the want of a horse the rider was lost, For the want of a rider the battle was lost, For the want of a battle the kingdom was lost— And all for the want of a horseshoe nail.
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.