Originally Posted by Rubber Duck

Thinking normally involves some in depth reasoning. Would you care to share you analysis. Or is this just a development of Descartes philosophy: "I think therefore it is so."

Unfortunately the word think is much abused and now has many meanings:

v.tr.
To have or formulate in the mind.
To reason about or reflect on; ponder: Think how complex language is. Think the matter through.
To decide by reasoning, reflection, or pondering: thinking what to do.
To judge or regard; look upon: I think it only fair.
To believe; suppose: always thought he was right.

To expect; hope: They thought she'd arrive early.
To intend: They thought they'd take their time.
To call to mind; remember: I can't think what her name was.
To visualize; imagine: Think what a scene it will be at the reunion.
To devise or evolve; invent: thought up a plan to get rich quick.
To bring into a given condition by mental preoccupation: He thought himself into a panic over the impending examination.
To concentrate one's thoughts on: “Think languor” (Diana Vreeland).
v.intr.
To exercise the power of reason, as by conceiving ideas, drawing inferences, and using judgment.
To weigh or consider an idea: They are thinking about moving.
To bring a thought to mind by imagination or invention: No one before had thought of bifocal glasses.
To recall a thought or an image to mind: She thought of her childhood when she saw the movie.
To believe; suppose: He thinks of himself as a wit. It's later than you think.
To have care or consideration: Think first of the ones you love.
To dispose the mind in a given way: Do you think so?

The one I go for is in Red.