You might ask what is to not be afraid?
As a young man my grandfather worked with a number of First World War veterans and therefore heard some pretty horrible stories.
He was in conversation with one of these men and made some remark about the difficulty of coping with extreme fear. The man told him that he had gone through the whole war as a front line soldier but had never really felt true fear. He "just got on with it".
He told how he returned home, without a scratch, and resumed work. One day he was walking through a long unlit rail tunnel, when he tripped over what turned out to be a sack of vegetables. He said that he was there in the dark and was suddenly back between the trenches and the sack was a body. He said that he was too scared to move for some time literally paralyzed with fear. When he could move he ran, just kept running until he could go no more. So whatever fear is, it is not necessarily a passing moment.