Quarrelling means trying to show that the other man is in the wrong. (And) There is no sense in trying to do that unless you and he had some sort of agreement as to what Righ and Wrong are.

First be sure that you know exactly what you want to say. Then be sure you have said exactly that.

We may ignore, but we can nowhere evade the presence of God. The world is crowded with Him. He walks everywhere incognito.

The most dangerous thing you can do is to take any one impulse of your own nature and set it up as the thing you ought to follow at all costs. There is not one of them which will not make us into devils if we set it up as an absolute guide. You might think love of humanity in general was safe, but it is not. If you leave out justice you will find yourself breaking agreements and faking evidence in trials "for the sake of humanity", and become in the end a cruel and treacherous man.

A sum can be put right: but only by going back till you find the error and working it afresh from that point, never by simply going on.

Oh, I'm a dangerous criminal, I am,' said the dwarf cheerfully.

If a man is going to write on chemistry, he learns chemistry. The same is true of Christianity.