If you understood a business perfectly and the future of the business, you would need very little in the way of a margin of safety. So, the more vulnerable the business is, assuming you still want to invest in it, the larger margin of safety you'd need. If you're driving a truck across a bridge that says it holds 10,000 pounds and you've got a 9,800 pound vehicle, if the bridge is 6 inches above the crevice it covers, you may feel okay, but if it's over the Grand Canyon, you may feel you want a little larger margin of safety.
The superior man, when resting in safety, does not forget that danger may come. When in a state of security he does not forget the possibility of ruin. When all is orderly, he does not forget that disorder may come. Thus his person is not endangered, and his States and all their clans are preserved.
…words have been all my life, all my life--this need is like the Spider's need who carries before her a huge Burden of Silk which she must spin out--the silk is her life, her home, her safety--her food and drink too--and if it is attacked or pulled down, why, what can she do but make more, spin afresh, design anew….
She felt drawing further from her and further from her an Archduke, (she did not mind that) a fortune, (she did not mind that) the safety and circumstance of married life, (she did not mind that) but life she heard going from her, and a lover.