Whoever is happy himself does not wish others harm? Is this true?

This statement is generally true. Generally speaking, people who are happy are more likely to be kind and compassionate towards others. They are more likely to be generous and understanding, and less likely to want to do harm to others.

This is because when people are feeling happy, they tend to be more focused on their own positive feelings and the things that bring them joy. This can lead to a greater sense of empathy and understanding for others, which in turn can lead to a desire to help and support them.

At the same time, it is important to recognize that this statement is not always true. People who are feeling happy can still be capable of doing harm to others, either intentionally or unintentionally. For example, someone who is feeling happy may act in ways that are inconsiderate or disrespectful towards others, or they may be too focused on their own happiness to recognize the needs of others.

Therefore, while it is generally true that someone who is happy is less likely to wish harm on others, it is important to recognize that this is not always the case.