This idiom means he "firmly decided." See how you translated a similar phrase in [Jeremiah 21:10](../21/10.md). Alternate translation: "I have made up my mind to oppose you" (See: [[rc://en/ta/man/jit/figs-idiom]])
Causing disaster to happen is spoken of as if disaster were an object that can be brought to someone. Alternate translation: "to cause disaster to happen to you" (See: [[rc://en/ta/man/jit/figs-metaphor]])