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.
Globalization makes our economy, our health, and our security all captive to events on the other side of the world. And no other nation on earth has a greater capacity to shape that global system, or to build consensus around a new set of international rules that expand the zones of freedom, personal safety, and economic well-being. Like it or not, if we want to make America more secure, we are going to have to help make the world more secure.
You can ensure the success of your attacks if you only attack places that are undefended. You can ensure the safety of your defense if you only hold positions that cannot be attacked. Therefore, that general is skillful in attack whose opponent does not know what to defend; and he is skillful in defense whose opponent does not know what to attack.
If I was wrong in yielding to persuasion once, remember that it was to persuasion exerted on the side of safety, not of risk. When I yielded, I thought it was to duty; but no duty could be called in aid here. In marrying a man indifferent to me, all risk would have been incurred and all duty violated.
In the course of 25 years, we have developed a constructive relationship with Mexico that was nonexistent before. During the last eight to 10 years there have been continued efforts which have resulted in a strategic alliance with the Mexicans and improved safety and security at the border.