Whether something is self-evident depends on the context and the individual's perspective. Some concepts or truths may be considered self-evident to one person but not to another. In general, self-evident truths are those that are immediately obvious or universally accepted without the need for further explanation or justification. However, what is self-evident to one person may not be to another, so it is important to consider different viewpoints when determining if something is self-evident. **

While some concepts may seem self-evident to some individuals, it is important to remember that not everyone may share the same understanding or perspective. What may be obvious to one person may not be as clear to another, due to differences in knowledge, experiences, or beliefs. Therefore, it is always beneficial to communicate and explain ideas thoroughly to ensure mutual understanding and clarity. **

Set theory is considered self-evident because it provides a foundational framework for understanding the concept of collections and their properties. The basic axioms of set theory, such as the existence of the empty set and the concept of subsets, are intuitive and can be easily grasped. Additionally, set theory serves as the basis for many other branches of mathematics, providing a clear and consistent language for expressing mathematical ideas. Its self-evidence lies in its ability to capture the fundamental nature of collections and their relationships in a simple and intuitive way. **

On the wedding night, it is self-evident that two individuals are coming together to start a new chapter in their lives as a married couple. It is a night filled with excitement, anticipation, and love as they consummate their marriage. The commitment and bond they share become more tangible and real as they begin their journey as partners for life. **

It is unclear without more context who "he" refers to in this question. However, if we assume "he" refers to a specific individual, then whether something has become too self-evident for him would depend on the specific situation and the individual's level of understanding or familiarity with the subject. If something has become too self-evident for him, it may suggest that he has mastered the concept or topic to the point where it no longer presents a challenge or requires further exploration. **

It should be self-evident to keep one's promise in situations where trust and integrity are crucial, such as in personal relationships, business agreements, and professional commitments. Keeping one's promise demonstrates reliability, honesty, and respect for others, which are essential for maintaining healthy and successful relationships. Failing to uphold promises in these contexts can lead to broken trust, damaged reputations, and negative consequences for all parties involved. **

The concept of humanity evident in Nazi ideology is one of extreme racial superiority and inferiority. The Nazis believed in the superiority of the Aryan race, viewing them as the master race, while deeming other races, particularly Jews, as inferior and a threat to the purity of the Aryan race. This dehumanizing ideology led to the persecution and ultimately the genocide of millions of individuals deemed as "undesirable" by the Nazis. The Nazi ideology stripped away the humanity of those they targeted, viewing them as less than human and unworthy of basic rights and dignity. **

One can filter or purify water using various methods such as boiling, using a water filter, adding chlorine or iodine, using UV light, or using a water purification tablet. Boiling water is one of the most effective methods to kill bacteria, viruses, and parasites. Water filters can remove impurities and contaminants from water, making it safe to drink. Adding chlorine or iodine can also kill harmful microorganisms in the water. UV light can be used to disinfect water by destroying the DNA of microorganisms. Lastly, water purification tablets can be used to kill bacteria and viruses in the water. **