It appears there might be a misunderstanding or confusion in your question. The terms "Amavasya" and "Purnima" are related to the lunar calendar used in Hinduism, and they refer to the phases of the moon.
As for the phrase "mental people do mental work," it is unclear what you mean by "mental people." If you are referring to individuals with mental health conditions or people experiencing mental challenges, there is no specific association between lunar phases and their ability to perform mental work or tasks.
Lunar phases are not considered to have any direct impact on mental health or cognitive abilities. Mental health conditions and an individual's capacity to perform tasks are influenced by various factors, such as the nature of the mental health condition, individual coping mechanisms, treatment received, and overall well-being.
It is essential to approach mental health with empathy, understanding, and evidence-based knowledge. If you or someone you know is experiencing mental health challenges, seeking professional help from mental health experts, counselors, or healthcare professionals is recommended. They can provide appropriate guidance and support tailored to the individual's specific needs.