కల్లు తాగిన కోతి!

"How hard it is to control the mind! Well has it been compared to the
maddened monkey. There was a monkey, restless by his own nature, as all
monkeys are. As if that were not enough some one made him drink freely of
wine, so that he became still more restless. Then a scorpion stung him.
When a man is stung by a scorpion, he jumps about for a whole day; so the
poor monkey found his condition worse than ever. To complete his misery a
demon entered into him. What language can describe the uncontrollable
restlessness of that monkey? The human mind is like that monkey,
incessantly active by its own nature; then it becomes drunk with the wine of
desire, thus increasing its turbulence. After desire takes possession comes
the sting of the scorpion of jealousy at the success of others, and last of all
the demon of pride enters the mind, making it think itself of all importance.
How hard to control such a mind!"

extracted from Vivekananda's Raja Yoga.