Premanand Maharaj Ji
Why do I feel fear and worry about the future, and how does bhajan remove it?
Sin is the root of fear
Fear, worry, restlessness and grief are signs of sin, past or present. When bhajan (devotional chanting and worship) makes your conduct pure and burns the old sin, you become fearless.
Sin is the cause of fear about the future. As long as sin remains, fear will remain, whether it is sin done now or sin done in the past.