An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

Wrong life cannot be lived rightly.

There is no question climate change is happening. The only arguable point is what part humans are playing in it.

Courage is resistance to fear, mastery of fear - not absence of fear.

Experience is the only prophecy of wise men.

I have had good experience and trial of this world...I know what it is to be a subject, what to be a sovereign, what to have good neighbours, and sometimes meet evil willers. I have found treason in trust, seen great benefits little regarded.

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

In moments of great grief, that’s where you look and immerse yourself. You realise you are not immortal, you are not a god, you are part of the natural world and you come to accept that.

It is the mark of an educated mind to be able to entertain a thought without accepting it.

As our case is new, we must think and act anew.

We choose our joys and sorrows long before we experience them.

If we don't believe in freedom of expression for people we despise, we don't believe in it at all.

Tis very certain the desire of life prolongs it.

If you don't know where you're from, you'll have a hard time saying where you're going.

Intellectuals solve problems, geniuses prevent them.

Nothing is as easy as it looks.

I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.

We sometimes congratulate ourselves at the moment of waking from a troubled dream; it may be so the moment after death.

Attitude, not Aptitude, determines Altitude.

If we do not lay out ourselves in the service of mankind whom should we serve?

The weak can never forgive. Forgiveness is the attribute of the strong.