another perspective on challenge:
"The Obstable is the Path"
"When you encounter a blockage -- a wall in your plans -- embrace it, adore it and realize that you put it there. Remember -- if it happens to you, it happens through you."
and a beautiful, challenging video: "No Mud, No Lotus" by Tara Brach (which i didn't look for. it just popped up in the sidebar as i watched something else, and was perfect for today)