Well, your statement clearly indicates that you believe the PC is a pawn with a clear implication that if the PC/Pawn does something to oppose the patrons cause then the patron is in the position to and will react accordingly.
That sounds like the DM, who controls the patron, determines what the patrons goals and desires are and can dictate what actions are in accordance with its goals and desires and can withhold powers granted to assure compliance.
I said that 70 pages ago and was ridiculed for following "fluff" language that wasn't actual a "rule."
I am in agreement with you though, what you say is correct. Unmentioned but assumed is that the paladin part of the equation, the divine being that grants you spells and other abilities, probably wants a say in the matter also.
I will say, without actual "rules" evidence, that that patron and divine being are many orders of power more intelligent and wiser then the PCs, with eons of experience in dealing with their "pawns" such that pulling a fast one on them probably has a very low probability of succeeding. In game terms, don't let the PC's bully you into something for their character, make them explain it somehow. If they cant make it sound reasonable to a powerful entity with vast resources, it probably isn't.