Descartes on Doubt

"Yet, before inquiring whether any such things exist outside me, I surely ought to consider the ideas of these things, insofar as they exist in my thought, and see which ones are distinct and which ones are confused." Descartes-Meditation 5- p. 87

Descartes seems pretty adamant about freeing himself from doubt. He feels as if he should weed out all of the thoughts that are not concrete. One should examine whether or not certain thoughts in the mind are distinct or confused and also which ones stand out the most. I think can be applied to most people's lives. One should find out what they know for sure and then go from there.