Iain Pears said this quote

Action is the activity of the rational soul, which abhors irrationality and must combat it or be corrupted by it. When it sees the irrationality of others, it must seek to correct it, and can do this either by teaching or engaging in public affairs itself, correcting through its practice. And the purpose of action is to enable philosophy to continue, for if men are reduced to the material alone, they become no more than beasts.

~ Iain Pears

[T]he concern of man is not his future but his present, not the world but his soul. We must be just, we must strive, we must engage ourselves with the business of the world for our own sake, because through that, and through contemplation in equal measure, our soul is purified and brought closer to the divine. ... Thought and deed conjoined are crucial. ... The attempt must be made; the outcome is irrelevant. Right action is a pale material reflection of the divine, but reflection it is, nonetheless. Define your goal and exert reason to accomplish it by virtuous action; successs or failure is secondary.

~ Iain Pears

She had lost herself in this old work, her personality dissolving into it, so that she had been set free. The immortality of the soul lies in its dissolution; this was the cryptic comment that so frustrated Olivier and which Julien had only ever grasped as evidence for the history of a particular school of thought. He had known all about its history, but Julia knew what it meant. He found the realization strangely reassuring.

~ Iain Pears

Philosophy cannot be extinguished, though men will try ... The spirit seeks the light, that is its nature. It wishes to return to its origin, and must forever try to reach enlightenment.

~ Iain Pears