Jamieson, Fausset and Brown on Ezekiel 24:23

23. ye shall not mourn ... but ... pine away for your iniquities--The Jews' not mourning was to be not the result of insensibility, any more than Ezekiel's not mourning for his wife was not from want of feeling. They could not in their exile manifest publicly their lamentation, but they would privately "mourn one to another." Their "iniquities" would then be their chief sorrow ("pining away"), as feeling that these were the cause of their sufferings (compare Le 26:39; La 3:39). The fullest fulfilment is still future (Zec 12:10-14).