Key Teachings of Buddhism - Stubborn Clinging

This is why the Buddha taught the four noble truths, why he began the path with the four noble truths: pointing out first that our clinging is suffering. This is the essence of all the mind’s sufferings: its ways of clinging to the five aggregates. The recognition of this suffering—the stress, the pain you’re causing yourself—and the recognition that it’s not necessary: Those are the only things that are going to get you out of those really stubborn mind states.~Thanissaro Bhikkhu " Stubborn Clinging"