At its most basic level, security means freedom from constricting or paralyzing fear or anxiety. In both our personal and work lives, fear can incapacitate. People can have excellent physical health and a strong purpose in life, but if they live in fear, their sense of safety and overall wellbeing is eroded.
However, there are good techniques to deal with fear, both as a real, current threat and in the face of chronic fear and anxiety. The most important thing to do is face the fear. Avoidance can add to danger in the short term and anxiety long-term.
It is also important to maintain your ongoing wellbeing, so you are resilient and physically replenished when fear-inducing experiences put extreme stress on you, physically, mentally, and emotionally.