Fear stunts every aspect of growth in every area. In humans fear stops us from becoming who we were meant to become and is not natural.
Take a sport like skiing where one excels when one accepts that fear has no place and only causes a frustration to skiing freely. Similarly in Golf any element of fear that arises has disastrous results in performance.
In most team sports when one team becomes overly conservative it damages their belief on the field of play and it results in the other team sensing the fear and capitalising on it.
Fear of making a mistake restrains us from taking that chance that would have made all the difference.
Consider that every invention was first a ridiculous thought before it manifested. The manifestation only came about because of the protagonists belief in it.
Akin to this is the number of successful entrepreneurs that admitted they only really became successful after multiple failures but sustaining their belief.