We are exactly where our thoughts are.
So when we delve into positive thinking, the energy around us shifts to become clear, pure and joyful.
If we busy ourselves with meaningless thoughts, then that's what our energy will be like.
There is this story about this old man at a wedding. While everyone was having fun, dancing on the dance floor and cheering the bride and groom, he sunk into reminiscing about a painful incident that happened to him two decades ago.
In that moment - was he present at the wedding, or was he back 20 years before? His physical body was at the wedding, but he wasn't there.
Literally, our mind is where our thoughts are.