Mathew 6:34

Do not worry about tomorrow, for tomorrow will worry about its own things.  Sufficient for the day is its own trouble.

We will never be fully engaged in today if we focus too much on tomorrow.  If we turn to the Lord and keep the focus on the day we are in, Jesus will walk us through removing the barriers and help us through.  We can only fight one obstacle at a time, and the future is never certain.  Jesus never meant for us to wear ourselves out but rely on Him.  Keep the faith on Jesus today, and He will see you through.