[Wagner]

Thought is born of the self-referential mental codification of perception and/or imagination. It is strengthened via repetition. All initial impressions, if favorable, become appeal or tendency, the which potentially transforming unto habit; and if continued still further these comprise what we call behavior or personality. Intricate patterns of serpentining thoughts (conceptualized in belief) are what afford the "individuality" of a person. These are all governed by attachment, with aversion being a mere perversion of that attachment, paradoxically (and ultimately) cognate to the same.

Can you engulf and hold the entire Pacific Ocean in your mouth? So it is with the limitations and flaws of the human mind in its search of comprehending "truth" (what is). Don't get me wrong, our minds are a fantastic tool, but a screwdriver alone cannot launch a space shuttle...

One-pointed Concentration (dharana) is the process of reversing said codification. Undoing the tendency as it were, by using some focus as the sole nexus for the attention so that one can (over time) ignore and weaken all of the contrivances built by the repetitions of attachment which cause the tendencies (vasanas) that create and direct our thoughts.