Jim Gordon shares a ripper from Brueggemann on Isaiah 40:28-29 that speaks powerfully to the anxiety that attends and motivates modern life:

‘Creation not only works for the powerful, the mighty, and the knowledgeable. It works as well for the faint, the powerless, the hopeless and the worthless. It works by giving seed to the sower and bread to the eater. It works so that strength is renewed. It is creation that precludes weariness and faintness, and invites walking, running and flying.

Evangelical concern may derivatively raise the issue of our terrible disorderedness that issues in unseemly anxiety and in inescapable fatigue. It is a good question to raise in a local parish; Why so driven, so insatiable, so restless? The answer, in this doxological tradition, is that our lives are driven because we are seriously at variance from God’s gracious food-giving program. 

And where there is a variance and a refusal to trust:
youth are faint and weary, 
     the young are exhausted, 
     and there is little liberated flying or exhilarated running. (Isaiah 40.30)’.

– Walter Brueggemann, Text under Negotiation: The Bible and Postmodern Imagination (Minneapolis: Fortress, 1993), 35-6.