A weighty part of developing confidence in Christ comes from not confining your thoughts exclusively to the present moment of your existence. This is not easy for any of us because the present moment of our existence is the one we see and feel. The present moment is the one that fills up our senses. You experience your present. You can only think about your past or your future.
The problem with this is the present moment - isolated from the past and future - has very limited spiritual nourishment in it. Living in the present moment to the exclusion of the past and future can drain trust in God rather than feed it. If the present moment is prosperous and delightful it draws all our attention to itself. It fosters false security. It distracts. It tends toward idolatrous infatuation. And if the present moment is painful, lonely, and horrifying it tends toward discouragement and fear and what our writer calls "throwing away our confidence"(35).
So the lesson here is lives tethered exclusively to the present moment aren't going to be lives with strong roots of enduring faith. And that this is our writer's primary concern for these Hebrew believers is obvious from the way he immediately encourages them not to throw away their confidence as he directs their thoughts into two directions away from their present circumstances.