die Maxime
maxim
A personal principle or rule of life according to which a person guides their actions.
Seine oberste Maxime war es, immer ehrlich zu sein.
His highest maxim was always to be honest.

maxim
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maxim
A personal principle or rule of life according to which a person guides their actions.
Seine oberste Maxime war es, immer ehrlich zu sein.
His highest maxim was always to be honest.

The word 'Maxime' (maxim) belongs to formal, educated usage. It is found more often in written language, in philosophical texts, or in sophisticated discussions.
Die Maxime des Unternehmens ist absolute Kundenzufriedenheit.
The company's maxim is absolute customer satisfaction.
The content of a maxim is often expressed with an infinitive clause with 'zu' (to) or a subordinate clause with 'dass' (that). The maxim itself appears as the subject or object in the main clause.
Er handelte nach der Maxime, anderen stets zu helfen.
He acted according to the maxim of always helping others.
Common verbs used with 'Maxime' (maxim) are 'einer Maxime folgen' (to follow a maxim), 'nach einer Maxime handeln' (to act according to a maxim), or 'eine Maxime haben' (to have a maxim).
Sie versuchte, ihr Leben lang ihren Maximen treu zu bleiben.
She tried to remain true to her maxims throughout her life.
The philosophical meaning of 'Maxime' (maxim) is found almost exclusively in the context of ethics, especially in Immanuel Kant. When the 'kategorischer Imperativ' (categorical imperative) is mentioned, this meaning is intended.
Im Seminar diskutierten wir Kants Konzept der Maxime als subjektives Handlungsprinzip.
In the seminar, we discussed Kant's concept of the maxim as a subjective principle of action.
rule / period
'die Regel' and 'die Maxime' can both be a principle for action. However, 'die Regel' is much more general and can come from outside, for example from a company, a school, or a law. 'die Maxime' is more of a personal principle that someone wants to live or work by. The words can be confused because both describe what someone uses as a guide. For concrete regulations, you usually use 'Regel'. For a personal idea about life or work, 'Maxime' fits better.

Sie sagt, dass Ehrlichkeit ihre wichtigste Maxime im Beruf ist.
She says that honesty is her most important maxim at work.
Die wichtigste Regel des Teams ist: Probleme werden sofort angesprochen.
The team's most important rule is: problems are addressed immediately.