What is the importance of the contemplation of dukkha for meditation?
Dukkha is the essence of Buddhist meditation.
The Buddha said the
full realization of dukkha is the first noble truth.
That's what leads you to give up the second noble truth, which is clinging.
When you see dukkha, and it doesn't mean thinking about dukkha, it means actually contemplating those things that are dukkha.
And when you see them as dukkha, when you're able to see that they are unsatisfying, then you will give them up.
You will give up the second noble truth, realize the third noble truth.
This is the path, which is the fourth noble truth.