The basic idea of <i>Critical Thinking</i> has already been provided by the Stoics, here is Epictetus' <i>Discourses</i>;<p><i>In the first place, do not allow yourself to be carried away by [the] intensity [of your impression]: but say, ‘Impression, wait for me a little. Let me see what you are, and what you represent. Let me test you.’ Then, afterwards, do not allow it to draw you on by picturing what may come next, for if you do, it will lead you wherever it pleases. (Discourses 2.18.24–5, trans. Hard)</i><p><i>The third area of study has to do with assent, and what is plausible and attractive. For, just as Socrates used to say that we are not to lead an unexamined life, so neither are we to accept an unexamined impression, but to say, ‘Stop, let me see what you are, and where you come from’, just as the night-watch say, ‘Show me your token.’ (Discourses 3.12.14–15, trans. Hard)<p>Make it your study then to confront every harsh impression with the words, ‘You are but an impression, and not at all what you seem to be’. Then test it by those rules that you possess; and first by this–the chief test of all–’Is it concerned with what is in our power or with what is not in our power?’ And if it is concerned with what is not in our power, be ready with the answer that it is nothing to you. (Handbook 1.5, trans. Matheson)</i><p>Reference: <a href="https://iep.utm.edu/epictetu/" rel="nofollow">https://iep.utm.edu/epictetu/</a>