Putting whitewash or plaster on the truth represents ignoring the truth. Alternate translation: "you hide the truth with lies" or "you lie and ignore the truth" (See: [[rc://en/ta/man/jit/figs-metaphor]])
Being a physician represents being a person who comforts others. Being of no value means that they do not know how to do what they should. Alternate translation: "you are all like physicians who do not know how to heal people" or "you all come to comfort me, but you do not know how, like unskilled physicians" (See: [[rc://en/ta/man/jit/figs-metaphor]])