Question every opinion. Let only your reason be the judge of your truths.
The Introduction to Stoic Philosophy provides an overview of the world in which Stoic philosophy took shape, and offers a survey of the nature of its ideas.
The Disciplines explain the three elements of thought to Stoic philosophical practice. The Three Disciplines also inform the Stoic Penknife Exercises. The Disciplines are the secret which gives dynamism and rhythm to Stoic writings such as Marcus Aurelius' Meditations. In this part we'll not only learn their internal structure but also start using them to interpret Marcus Aurelius and to practice our own exercises and write our own quotations.
The Discipline of Action corresponds to the activity of Impulse (to action) and considers the interconnections, dependencies and feeling of belonging that the Stoic has with respect to others. This refers not only to her relationship with other humans and human institutions (family, politics, friendship, etc.), but also to biological systems such as her own body or the ecosystem.
Using this Discipline, the Stoic can consciously regulate her agency in the world, because the Discipline helps her to find her kinships (animal, social, rational communities), which are required to develop her feelings of meaningfulness, belonging, caring and loving. Here we find the ethical core of stoic philosophy.