A summary of the problem of Life might focus on the need to value our temporary, minute mortal exeriences; and also to frame them in eternity and the infinite.
If we focus only on mortal life it seems on the one hand that the present instant is of overwhelming - indeed crushing - importance, but on the other hand nothing really matters because death and decay will annihilate everything.
Yet if we try to take the perspective that only the eternal and infinite matter, then our earthly mortal life is rendered insignificant and pointless.
I believe that we need to regard the common state of chronic fear as an enemy; but saying not to be afraid is itself futile.
All positive change, all significant change, requires at least two changes - to live without fear requires hope - that is, requires a perspective that mortal life is both significant and also that eternity is primary.
In other words, the experiences of mortal life are why we are here and now and ourselves, but these exeriences are ultimately means to eternal ends.
Exeriences may be of permanent significance, but this significance relates to the fact that we are eternal souls engaged in a quest to become more fully divine.
Therefore to combat fear in our lives, it is not enough simply to try and suppress the emotion, because that emotion was created and sustained by the 'mortal' perspective - but we can put that fear into a proper context when we recall the primary reality of the human condition.
Then we will see fear as merely a mortal phenomenon, and evaluate it from its eternal significance - at which point all negative and harmful fears will lose their sting, and we will achieve the virtue of courage.