I’d like to learn about Stoicism. I’ve heard people praise it as a helpful philosophy for dealing with life’s challenges, but I don’t know much about it. Can you introduce me to the key principles of Stoicism and suggest a few famous writers or philosophers I should read for further understanding?
Absolutely, Stoicism is an ancient Greek philosophy that teaches the development of self-control and fortitude as a means of overcoming destructive emotions. It does not seek to extinguish emotions completely, but rather to transform them by a resolute 'askēsis' that enables a person to develop clear judgment and inner calm.

The key principles of Stoicism include:

1. Acceptance of what is beyond our control: Stoics believe that the external world is unpredictable, and the only thing we can truly control is our inner world - our responses, judgments and perceptions.

2. Virtue is the highest good: Being a good person and living a virtuous life are the main goals in Stoicism.

3. Live in accordance with nature: This means understanding the natural order of the world and our place within it, and living in a way that aligns with this understanding.

4. The use of reason: Stoics place high value on the power of reason and logic, using these faculties to navigate through life’s difficulties.

As for literature, the works of the following stoic philosophers should serve you well:

- Marcus Aurelius: His book, "Meditations," is a first-hand account of a philosophy developed in the face of challenging life circumstances, including health issues and political strife.
- Seneca: His "Letters from a Stoic" and "On the Shortness of Life" are insightful and thought-provoking works.
- Epictetus: His "Discourses" offer solid, practical advice and wisdom.

There are also many modern resources dedicated to Stoicism, including books and online communities where Stoic principles are interpreted and explained in contemporary contexts. A recommended modern book is "A Guide to the Good Life: The Ancient Art of Stoic Joy" by William Irvine.