Tip of the hat to Tim Challies for the link.
All good books on preaching start with a section on the character of the preacher. I tip my hat at this noble practice by reminding you that if you brandish your iPad to complement the trendy hipster image you are carefully cultivating like a hidden hydroponic hemp garden, know this: God knows your heart, and your people will soon smell the stale odor of your pretentiousness. Your iPad, like a ninja, should be undetectable to your congregation. If you pace the platform like a techno-peacock, toting your e-notes into plain sight, then you need to go back to your paper library and read the first chapter of all your preaching books. Be the right person.