Andrzej Sapkowski said this quote

You've a right to believe that we're governed by Nature and the hidden Force within her. You can think that the gods, including my Melitele, are merely a personification of this power invented for simpletons so they can understand it better, accept its existence. According to you, that power is blind. But for me, Geralt, faith allows you to expect what my goddess personifies from nature: order, law, goodness. And hope.

~ Andrzej Sapkowski

If Elirena was a hero, if what she did is heroism, then that's just too bad. Let them call me a traitor and a coward. Because I, Yarpen Zigrin, coward, traitor and renegade, state that we should not kill each other. I state that we ought to live. Live in such a way that we don't, later, have to ask anyone for forgiveness. The Heroic Elirena... She had to ask. Forgive me, she begged, forgive me. To hell with that! It's better to die than to live in the knowledge that you've done something that needs forgiveness.

~ Andrzej Sapkowski

They are not demons, not devils...Worse than that.They are people.

~ Andrzej Sapkowski

For the moment, I am relying on the authority of Cahir aep Ceallach, the only soldier in our company-and Cahir confirmed that winning battles by means of a rapid escape from the battlefield is permissible from the point of view of most military doctrines.

~ Andrzej Sapkowski