The fear of the unknown is a very common human tendency. Most people are constantly engaged in making sure that their world plays out just like how their mind would imagine. However, the reality is that there is no possibility for growth without embracing the unknown.
When we shut off the mystery or awe factor in life, we not only curtail growth, but also unknowingly make life mechanical. Just like there is no fun in watching a game whose result is already known, life will also be very boring...