Mark 14:36 refutes Oneness Pentecostal modalism by demonstrating distinct wills between Father and Son.

Mike recommends setting aside secondary issues (tongues, falling out) and focusing on the person of Christ. He offers Mark 14:36 as a pointed anti-modalist text: Jesus prays Abba Father... not what I will but what you will — establishing (1) a you (Father) and a me (Son), two distinct persons, and (2) a difference in will/desire, which is impossible under modalism. The two pillars of Trinitarian doctrine: (1) Jesus is God; (2) Father, Son, and Spirit are distinct persons. Practical pastoral advice: do not match his anger; know when to be quiet for the sake of the marriage; continue praying for him.