http://philosophicalguidance.com/2020/07/29/certainty-synthesis-part-v/
The seventh most certain ethical principle is the golden rule: Treat others as you would have them treat you. This universally expressed principle follows flawless logic and is rephrased by Immanuel Kant as “never treat a person as a means, only as an end.” The universalization of this law assures each person equal protection in a world of others.
Logic alone gives us the seventh most certain ethical principle: Inaction is a form of action. Therefore, duty to others and community requires deliberation even on the decision not to act. The eighth follows a complicated analysis as outlined in the section on good and evil:1 The highest good is the combination of happiness and meaning.
When we apply reason to the third, fourth, and sixth tenets above, we arrive at a contingent certainty: When possible, maximize the good for self and others. This is the fundamental principle of the Utilitarians. Its greatest weakness is the difficulty of ascertaining action or actions that maximize the good for self and others, but the deontological validity is unquestionable in the face of the impeccable logic it reflects.
Again we can construct a chart of these top ten ethical ‘certainties.’ And again other propositions can be added such as Membership in society entails obligations or duties to that society, a highly justified belief as the benefits of social organization are based on universal compliance with accepted rules and one may freely choose to withdraw from the society.
Kant may be correct that we can never know what will make us happy, but compliance with these carefully determined propositions seems likely to make us “worthy to be happy.”
| PROPOSITION | DEGREE OF CERTAINTY | COMMENTS | |
| 1 | I have free will. | 99.5 | |
| 2 | Human conduct has effects. | 98.8+ | |
| 3 | There is good and evil. | 98.8 | |
| 4 | Good conduct is preferable to evil conduct. | 98.7+ | |
| 5 | First do no harm. | 98.7 | To other people. |
| 6 | I should aim to make a good life for myself. | 98.6+ | Without doing harm to other people. |
| 7 | Treat others as you would have them treat you. | 98.6 | |
| 8 | Inaction is a form of action. | 98.5+ | |
| 9 | The highest good is the combination of happiness and meaning. | 98.3 | |
| 10 | When possible, maximize the good for self and others. | 98.2+ | Utilitarianism |
| Membership in society entails obligations or duties to that society. | 97.0 | ||
| In matters of importance, one ought to tell the truth. | 96.0 | One of Kant’s principles of universalization. | |
Next time we will investigate truths of the highest degree of certainty regarding ultimate reality.
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1See post 1/23/2019 this site.
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There is no ethical question on the destruction caused by a tornado since the tornado is not thought to be a cognitive agent with free choice. Likewise there is no moral responsibility for my kicking the physician who taps my knee with his hammer while standing too close to my foot. Only voluntary actions are the subject of ethics.

“Natural objects, for example, must be experienced before any theorizing about them can occur” – Edmund Husserl
For example, my experience of a “box” is examined rather than the actuality of the box before me; my experience includes seeing some of its surfaces, but not others (the back and underside of the box). Phenomenology says I experience color while empiricism and science define the apple as red.
Very closely related is the statement: I control my body. This is confirmed not only by my ability to move its various parts, but also by my ability to focus my attention on the various components of perception such as isolating listening to a “bird” or smelling of a ‘flower.”
So what is the most certain feature of internal reality? Of course it is our own thinking process which Descartes distilled into his famous phrase “cogito ergo sum” or “I think therefore I am.” However, with all due respect to Descartes, slightly more certain is a modification by Bernard Williams, “There is thinking,” although I feel the most certain sentence imaginable is more nonspecific: “There is something.” 
“Certainty, generally, is an illusion, and repose is not the destiny of man.” – Oliver Wendell Holmes
So now I hope to take these tools to task in creating a list of important principles within each group stratified on the degree of certainty of each. We begin with metaphysical principles next time.
He also quotes Ludwig Wittgenstein: “the world is the totality of facts, not of things.”5 And while the skeptic can challenge thought as depending on language and the imperfect meanings of words, Scruton thinks trust in thought is justified since those words are human in origin and hence are correctly applied to human reality. Moreover the fact that language is shared by others validates our belief that the mind is not completely private.6
The human experience is clearly different from that of a fish, a fly, or a bat; perhaps none of these is definitive, and it is chauvinistic for us to elevate the human picture above the others. However, since we are, after all, human and have only our own biologic equipment to inform us, it is difficult to imagine a better alternative from which to determine degrees of certainty or a plan for living.
“You cannot prove realism to a complete skeptic or idealist, but you can show an honest man that he is not a complete skeptic or idealist, but a realist at heart. So long as he is alive his sincere philosophy must fulfill the assumptions of his life and not destroy them.” – George Santayana.
On the other hand, the blueprint of a meaningful and flourishing life is more dependent on internal, proximate, and ultimate reality – none of which can be fully informed by science or outside authority. So we disembark in our journey at Kierkegaard’s great discovery – subjective truth. Using a mixture of individual intuition, experience, belief, and reason, each person must define fundamental principles in approaching life and the world which are validated by their coherence, instrumentality, and predictive efficacy. No principles thus derived are absolute, but with careful reflection and constant re-evaluation, we can structure them in degrees of certainty or justification for action. Once we stratify these principles, they can be deployed for priority in action. At that point science can be instrumental in effecting our priorities. Of course we also need to have fortitude to comply with our own stratified ‘certainties.’
“I beseech you in the bowels of Christ think it possible you may be mistaken.” – Oliver Cromwell.
He concludes with a stop at the site of a former concentration camp where he argues the holocaust was the result of intolerance stemming from the ‘certainty’ of Nazism which ironically occurred at nearly the same time science was demonstrating certainty to be an illusion.