Those who are truly clever have the ability to reproach himself with his own past.

With necessity he makes occasional repetitive observation of his own behaviour in the past, conclude his mistakes, reasons the motives and errors (Cognitive or factual), gives remedy to prevent the behaviour from occuring again either physical or cognitive senses, and continue to monitor to see whether other measures are necessary.

As to myself, I fear that currently my own problem is the lack of attention, and perhaps the remedy to that I can think of right now, is to reduce materialism even further.