Whether Christ acquired His judiciary power by His merits?

Objections

Objection 1 : It would seem that Christ did not acquire His judiciary power by His merits. For judiciary power flows from the royal dignity: according to Prov. 20:8: "The king that sitteth on the throne of judgment, scattereth away all evil with his look." But it was without merits that Christ acquired royal power, for it is His due as God's Only-begotten Son: thus it is written (Lk. 1:32): "The Lord God shall give unto Him the throne of David His father, and He shall reign in the house of Jacob for ever." Therefore Christ did not obtain judiciary power by His merits.
Objection 2 : Further, as stated above (Article [2]), judiciary power is Christ's due inasmuch as He is our Head. But the grace of headship does not belong to Christ by reason of merit, but follows the personal union of the Divine and human natures: according to Jn. 1:14,16: "We saw His glory . . . as of the Only-Begotten of the Father, full of grace and truth . . . and of His fulness we all have received": and this pertains to the notion of headship. Consequently, it seems that Christ did not have judiciary power from merits.
Objection 3 : Further, the Apostle says (1 Cor. 2:15): "The spiritual man judgeth all things." But a man becomes spiritual through grace, which is not from merits; otherwise it is "no more grace," as is said in Rm. 11:6. Therefore it seems that judiciary power belongs neither to Christ nor to others from any merits, but from grace alone.