Happiness is often perceived as a ratio of what one has to what one desires, suggesting that contentment can be achieved by adjusting expectations. External factors, such as possessions and relationships, can influence happiness, but internal attitudes and practices also play a crucial role. Scientific studies indicate that happiness can be linked to brain activity and physiological states, with a focus on harmony versus dissonance. Depression, in contrast, can lead to negative physiological changes and reduced social behaviors, highlighting the importance of mental health. Ultimately, achieving happiness may involve a balance of external circumstances and internal acceptance.