By the author of the Tipping Point, Blink is an examination of how people think. There are many unconscious ways that influence our decisions - moments of decision that occur in the blink of an eye. This book is an easy to read look at a psychological subject.
Gladwell doesn't draw a whole lot of conclusions. Instead, he presents ideas and allows the reader to decide for themselves. He does state, however, that it is impossible to truly know why we make the choices we do. He attempts to present research which can suggest what our unconscious mind intends. I don't agree with him on every point. If one believes in the Divine, then it would be impossible to agree with him. If you submit (or try to) your will to a higher being, then your choices will be influenced in a particular direction.
Even if you do believe in Divine influence, there is something to be said for how we behave based solely on the function of our organic brain. Individuals with brain injuries will experience a change in behavior that cannot be explained any other way. The book definitely provides for some interesting reading.