He made the remarks in a meeting with intelligence minister and his deputies.
He appreciated the services of the Intelligence Ministry to guide public opinion in the course of the nuclear negotiations and said the significant role of the intelligence ministry have been praised by all people.
The country is now approaching the implementation of Joint Comprehensive Plan of Action (JCPOA), he said.
Zarif said that the intelligence ministry should be regarded as the biggest help for the JCPOA.
Intelligence Minister Seyyed Mahmoud Alavi, for his part congratulated the birth anniversary of prophet Mohammad (PBUH) and Imam Sadeq (AS) and appreciated the sincere efforts of the Iranian nuclear negotiators.