The bench, headed by the Chief Justice of India Dipak Misra, is examining the constitutional validity of Aadhaar challenged in petitions that contend the Aadhaar programme violates an individual's fundamental right to privacy.
"This judgment will decide the course that this country takes," Mr Sibal, also a senior Congress leader who is representing the West Bengal government in this case, said.
"Will we live in a country where there is choice - or do we live in a country where the State is the arbiter of choice," he said, exhorting the five-judge bench to remember the gravity of this case when they deliver their judgment.
At previous hearings, judges have remarked that there was a need to balance national interest and right to privacy. On other occasions, the court has indicated that it would not be inclined to rule against Aadhaar on the ground that it could be misused or that people could be denied benefits due to the Aadhaar law.
In course of Tuesday's hearing, Mr Sibal attempted to drive home the point that the court's verdict would have more far-reaching consequences than had been commonly understood.
The ADM Jabalpur case, he said referring to the 1976 court ruling upholding then Prime Minister Indira Gandhi's decision to suspend fundamental rights during Emergency, was only about a limited regime. The implication of the verdict Aadhaar case, in contrast, would be unlimited.
Mr Sibal's reference to the 1976 verdict was interesting.
One of the four judges who had delivered that verdict was Justice YV Chandrachud.
Justice DY Chandrachud was also part of the bench that last year recognized privacy as a fundamental right, a ruling that forms the basis of the clutch of 27 petitions on Aadhaar. Justice DY Chandrachud was among the nine judges who called the 1976 verdict as "seriously flawed".
At the hearings on Aadhaar law, Justice Chandrachud, 58, who is known for speaking his mind, has often questioned the petitioners about their reservations to making Aadhaar mandatory for all citizens.
As the court heard Mr Sibal talk about how the Aadhaar law took away the rights of individuals to produce any identity proof, Justice Chandrachud wondered aloud if the provision to produce Aadhaar could be seen as reasonable restriction.
"The moment you impose a condition, you're denying a citizen of his rights. No defence can be taken from state like infrastructure is not in place," Mr Sibal said. But doesn't there have to be some proof of a person's entitlement to the facility, the judge asked.
Mr Sibal responded that Aadhaar doesn't establish a person entitlement. As long as one can prove his identity for the purpose of that entitlement by any method, he should be entitled to the benefits.
The arguments will resume on Thursday.