One of the meanings of the word "inspiration" is "the drawing of air into the lungs." Inspiration can be seen as divine, but it can also be as mundane as taking a breath.
When we breathe, when we simply are, we open to the silence that seems to enhance the possibility of inspiration. But how often can we be inspired? On a good day, we might get five minutes, but as Seth Godin points out in his excellent post, that could be five minutes more than a lot of other people.
Inspiration is a gift, and we have to remind ourselves not to squander it.