In a speech to parliament, Mohammad Javad Zarif emphasised that last week's agreement would secure the lifting in coming months of UN and Western sanctions imposed on Iran over its nuclear programme.
In return, Iran has agreed to put curbs on its atomic activities for at least a decade but it will continue to enrich uranium and be allowed to pursue research and development of more modern nuclear technology.
The deal and restrictions, including a more rigorous inspection regime, aim to remove Western concerns that Iran is seeking an atomic bomb - an allegation it has always denied.
In a sign of their scepticism, just days before the final negotiations started in Vienna, lawmakers passed a new law which they said was to defend the nuclear programme, but which the government opposed.
Some hardliners in parliament have railed against the diplomacy, arguing that too many concessions were made.
But Zarif said that the long-running talks could never have satisfied Iran's or the West's every demand.
"We should not forget that any deal is a give and take and each side gives up part of its demands to realise the more important part until what has been given and received is balanced," he said.
Suggesting that Iran got the better side of a bargain with the West, and reiterating Tehran had never sought nuclear weapons, Zarif added: "What they gained was a vain effort to get what was already acquired.
"Our biggest achievement is the stamp by the UN Security Council confirming (uranium) enrichment in Iran."
However, in a move that could possibly delay parliament's approval of the deal, lawmakers voted to appoint a 15-member committee to evaluate the text of the Vienna agreement. Its members are yet to be selected.
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