Setting goals can blind you to opportunities. You might be trying to get to point C. When opportunity B comes, you don't even look at it because you're going straight to C. ↗
I studied with a blind teacher from about 5 until I was 16, at two different schools. From the age of 12 until 16, I was in a boarding school-which, I believe, at that time was compulsory for blind children. ↗