The people you hang out with actually have an impact on your engagement with reality beyond what you can explain.

The most important decision is who you surround yourself with.

To maximise happiness and minimise stress, build a life that requires fewer decisions by surrounding ourselves with people who embody the traits we prefer. Over time, we will naturally pick up those desirable attitudes and behaviours. At the same time, we can avoid the mentally taxing low-level decisions that sap the energy needed for higher-stakes decisions.

According to Moran Cerf, a neuroscientist at Northwestern University who has been studying decision-making for over a decade, the surest way to maximise happiness has nothing to do with experiences, material goods, or personal philosophy. It is all about who you decide to spend time with. Personal company is the most important factor for long-term satisfaction.

Source: A neuroscientist who studies decision-making reveals the most important choice you can make