There is a kind of monkey trap used in Asia. A coconut is hollowed out and attached by a rope to a tree or stake in the ground. At the bottom of the coconut, a small slit is made and some sweet food is placed inside. The hole on the bottom of the coconut is just big enough for the monkey to slide in his open hand, but does not allow for a closed fist to pass out. The monkey smells the sweets, reaches in with his hand to grasp the food and is then unable to withdraw it.
The clenched fist won’t pass through the opening. When the hunters come, the monkey gets frantic but cannot get away. There is no one keeping that monkey captive, except the force of its own attachment. All that it has to do is to open the hand. But so strong is the force of greed in the mind that it is a rare monkey which can let go.
It is the desires and clinging in our minds which keep us trapped. All we need to do is to open our hands, let go of our selves, our attachment, and be free.
Joseph Goldstein “The Experience of Insight”