Very true - too many seek to justify extremes rather than look at balance.
As with so many elements, being able to look inside one's self, to listen to how you are developing (or not), building the physical and mental energy to power positive emotions and renew the spiritual. This requires interaction interspersed with reflection and turning the questions inward.
Sigma? Confidence to act alone and also seek the guidance and engagement when it is felt it adds positively.