KingHarvest wrote:And modus is quite right in his interpretation. Clauses of characteristic are especially common after vague antecedents like in this example.
no i don't think.
"alteri quod faceris" is not a clause of characterisatic: in regard of what would "quod" be characterised?
And then, such a clause is generally introduced by "est/sunt qui", "inveniuntur/reperiuntur qui", "non desunt qui", "nemo est", "invenitur qui", "nihil est quod (cur, quare)", "quis est qui?", "quid est cur (quare)?", "dignus/indignus qui" and other similar phrases.. well this is not our case, and anyway the antecedent is not vague..
the future perfect tense is perfect for this sentence: "expect from the other (in the future) what you will have done to the other (so perfect future)"