I’ve noticed my most successful friends are also my happiest friends, and vice versa. I never knew if it was correlation or causation, but I generally find I am happier myself and perform better if I surround myself with other people like that. Negativity is contagious, so I try to avoid it.
Positivity is contagious too! I had a co-worker who just exuded genuine positivity, and he was a joy to be around and I couldn't help being in a more positive mood myself.
