The word "healthy" here is a dead metaphor for true, trustworthy, and morally good. See how you translated "healthy" in [2 Timothy 1:13](../01/13.md). Alternate translation: "trustworthy teaching" (See: [[rc://en/ta/man/jit/figs-metaphordead]])
Paul speaks of people obtaining many teachers as if it were putting them into a heap or pile. Alternate translation: "they will listen to many teachers who assure them that there is nothing wrong with their sinful desires" (See: [[rc://en/ta/man/jit/figs-metaphor]])
Paul speaks of people strongly wanting to hear something as if their ears itched and could only be satisfied if teachers taught them what they wanted to hear. Alternate translation: "who say only what they want so much to hear" (See: [[rc://en/ta/man/jit/figs-idiom]])