When the #Buddha talked about meditation he talked about deepening the practice of letting go. Anyone who has practiced meditation will know that there are many obstacles to quiet the mind. And those obstacles are only overcome through this aspect, or this movement of the mind, that we call letting go.
All the cravings and desires come from a sense of 'self' trying to control the world, trying to manipulate the world in order to seek illusory happiness that it thinks it can manufacture and keep. It's the basic delusion of human beings and of all other beings in the Cosmos.
All beings think they can manufacture, attain and keep happiness. All beings tend to reach out for happiness, but it's always just a little bit ahead of them. We hang on the hope that one day we may be able to find this illusive happiness 'out there' somewhere.
That is the illusion that keeps the mind thinking, keeps the mind planning. We keep going out into the world, rather than stopping the mind thinking, calming the mind and keeping it here inside.