He said the talks should not be even postponed, notwithstanding the provocative attack at the Indian Air Force base in Punjab.
"Pakistan's open declaration that it is taking appropriate action on the information supplied by India must be accepted at face value. This is good enough to continue the talks.
"This opportunity, if lost will only help the terrorists in plotting both against Pakistan and India," Justice Sachar said in a statement.
India has linked the FS-level talks to Islamabad's "prompt and decisive" action in the Pathankot terror attack for which it has provided "actionable intelligence".