醫國之能 The Power To Heal A Kingdom
國王道：「法師何必太謙？朕當今日登殿，幸遇法師來朝，誠天緣也。高徒既不知醫，他怎肯揭我榜文，教寡人親迎？斷然有醫國之能也。」国王道：「法师何必太谦？朕当今日登殿，幸遇法师来朝，诚天缘也。高徒既不知医，他怎肯揭我榜文，教寡人亲迎？断然有医国之能也。」
逐句解 Line by line
The king said, "Why should the Master be so modest?
何必 opens an objection rather than a question. The king is not asking why; he is declining to accept the answer he has been given.
"On the very day I come up to the hall, I have the good fortune to meet the Master at court. It is truly a bond of Heaven's making."
當 is dāng, marking the day itself. 天緣 — a bond of Heaven's making — is the same providential reading he gave the coincidence when the monk first arrived.
"If the worthy disciple knows no medicine, why would he take down my proclamation and have me come to fetch him myself?"
教 is jiào, to make somebody do something. The king has grasped the demand exactly, and repeats it as a question he expects no answer to.
"Assuredly he has the power to heal a kingdom."
醫國之能 answers the 醫國之手 the crowd used at the drum tower — the same four-character frame with one character changed, travelling from a street mob to a throne.
The king's reasoning is airtight and every premise is false. Nobody would take down such a notice without meaning to answer it; nobody would demand a royal escort without the power to justify it. Both are sound inferences about a normal person.
Telling the monk not to be so modest is what seals it. Tripitaka has told the exact truth and been complimented on his humility, which leaves him no way to say it again.