The will of your Father (θέλημα ἔμπροσθεν τοῦ πατρὸς ὑμῶν)
Though some read my Father (μοῦ). Lit., There is not a will before your (my) Father. So Wyc., It is not will before your Father. Meyer paraphrases, There is not before the face of God any determination having as its object that one of these, etc.