Be calm in arguing for fierceness makes error a fault and truth discourtesy.

An error is the more dangerous in proportion to the degree of truth which it contains.

There are sadistic scientists who hurry to hunt down errors instead of establishing the truth.

The man who cannot endure to have his errors and shortcomings brought to the surface and made known but tries to hide them is unfit to walk the highway of truth.

It is one thing to show a man that he is in an error and another to put him in possession of the truth.

There is no such source of error as the pursuit of truth.

Truth emerges more readily from error than from confusion.

What is earnest is not always true on the contrary error is often more earnest than truth.

The discovery of truth is prevented more effectively not by the false appearance things present and which mislead into error not directly by weakness of the reasoning powers but by preconceived opinion by prejudice.

If you shut the door to all errors truth will be shut out.

Man approaches the unattainable truth through a succession of errors.

To rise from error to truth is rare and beautiful.

It is error only and not truth that shrinks from inquiry.

Nine times out of ten in the arts as in life there is actually no truth to be discovered there is only error to be exposed.

Ignorance is preferable to error and he is less remote from the truth who believes nothing than he who believes what is wrong.

An error does not become truth by reason of multiplied propagation nor does truth become error because nobody sees it.

Better to trust the man who is frequently in error than the one who is never in doubt.

Air travel survived decades of terrorism including attacks which resulted in the deaths of everyone on the plane. It survived 9/11. It'll survive the next successful attack. The only real worry is that we'll scare ourselves into making air travel so onerous that we won't fly anymore.

To a considerable extent we are faced by a technology arms race with terrorists. The communications revolution has made it easier for terrorist groups to reach out to vulnerable individuals with their violent extremist ideology and propaganda. It has also facilitated fundraising recruitment and training.

The only protection as a historian is to institute a process of research and writing that minimizes the possibility of error. And that I have tried to do aided by modern technology which enables me having long since moved beyond longhand to use a computer for both organizing and taking notes.

Countries across the world are taking action now to help them track paedophiles and terrorists who abuse new technology to plot their horrific crimes.

This is technology that will not go away. And to risk it moving into the hands of a terrorist group like al Qaeda or to other focused enemies of the United States would have tragic consequences.

We're in a new world. We're in a world in which the possibility of terrorism married up with technology could make us very very sorry that we didn't act.

If the terrorists have the sympathy of people it's much harder to find them. So we need people on our side and that leads us to be responsible leaders of the world show some concern with the problems.