0the warmest of greetings = 02br 00the warmest (possible) type of greetings, the warmest kind of greetings, the warmest form of all possible greetings02br 02br 00the whitest of cloth = 02br 00the whitest type of cloth02br 02br 00the best of luck = 02br 00the best possible outcome of luck02br 02br 00We add 01b 00"of"02b 00 to e x p a n d and e x t e n d the meaning, to politely exaggerate and to emphasize 01i 00adjective02i 00 and not the 01i 00object02i 00. 02br 02br 00I guess you have a good idea why 01b 00"of"02b 00 is added. 02br 02br 00Observe that we say: "the warmest regards" because regards is slightly more formal than greetings.
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