Final answer:
According to Alfred Adler, the most important evidence of mental health is an individual's ability to establish social connections and work together for the betterment of all.
Step-by-step explanation:
According to Alfred Adler, the most important evidence of mental health is an individual's ability to establish social connections and work together for the betterment of all. Adler believed that the happiness of mankind lies in living as if each individual has set themselves the task of contributing to the common welfare. He emphasized the importance of conscious motivation and identified three fundamental social tasks: occupational tasks (careers), societal tasks (friendship), and love tasks (finding an intimate partner for a long-term relationship).