Dukkha: Suffering
Dukkha is the ache running through conditioned life, and labor stalled at the last moment is its plainest picture. Sennacherib's army presses the wall from outside while inside there is pressure with nowhere to go: one shape, two places. Buddhism opens its first truth with birth itself, so a child held at the door of the world is the original picture of trouble.
Anattā: Not-self
Anattā is the absence of any owner who can command how things go. "There is no strength to deliver them" states the argument in one line, since a body we owned would obey us: we would say push, and it would push. A woman in the last hour cannot decide to be finished, and a king behind a wall cannot decide his city will hold.
Kamma: Action and its fruit
Kamma is action bearing fruit in its own time. Hezekiah reads the siege as rebuke because years of tribute, alliance, and royal decisions have come due together, and the hour of ripening was never his to choose. Fruit drops when it is ready, onto whoever is standing under the tree.
Saṃvega: Urgency
Saṃvega is the jolt that turns a settled life toward what matters. Torn clothes and sackcloth are what that jolt looks like on a king who until this morning had walls, treasury, and time. The siege accomplishes what comfort never did, stripping away any sense that tomorrow is owed to him, and he sends for the prophet the same day.
Saraṇa: Refuge
Saraṇa is the shelter one goes to when nothing of one's own holds. With no strength left to deliver, Hezekiah spends what remains on messengers to Isaiah and on his own walk into the house of the Lord. A refuge is tested only when strength runs out, and that hour has arrived with the army still camped outside.