Sympathy (n.) you do not need can be humoured with a doleful face, while you laugh at your comforters in secret.
Sympathy (n.) may weep with the mourner in words, provided you do not weep inside; the grief belongs to his judgement, not to the event.
Sympathy (n.) misplaced — everyone pities my headache though my head is sound; I draw a long face, agree, and smile quietly to myself.
Sympathy (n.) for a weeping man may go as far as words, even groaning with him — but remember it is his judgement, not what happened, that distresses him, for it does not distress another.
Sympathy (n.) may groan aloud alongside a grieving person, but must take care not to groan inside as well.