The Supreme Court handed down its 5–4 decision upholding the state law on February 10, 1947. The decision was the first to hold that the Establishment Clause was applicable against the states. It is also remembered as the first Supreme Court case to attempt an explanation of the Establishment Clause.
Majority opinion In a majority opinion by Justice Hugo Black, the Supreme Court ruled that the state bill was constitutionally permissible because the law had a "public purpose" to provide safe transportation to parochial school students. The Court's interpretation of the Establishment Clause was broad and would guide the Court's jurisprudence for decades to come.
Arthur E. Sutherland Jr. called it "the most influential single announcement of the American law of church and state". Black's language was sweeping: The 'establishment of religion' clause of the First Amendment means at least this: Neither a state nor the Federal Government can set up a church. Neither can pass laws which aid one religion, aid all religions or prefer one religion over another. Neither can force nor influence a person to go to or to remain away from church against his will or force him to profess a belief or disbelief in any religion. No person can be punished for entertaining or professing religious beliefs or disbeliefs, for church attendance or non-attendance. No tax in any amount, large or small, can be levied to support any religious activities or institutions, whatever they may be called, or whatever form they may adopt to teach or practice religion. Neither a state nor the Federal Government can, openly or secretly, participate in the affairs of any religious organizations or groups and vice versa. In the words of Jefferson, the clause against establishment of religion by law was intended to erect "'a wall of separation between Church and State." This highly influential dictum was supported only by a historical analysis based on
James Madison's
Memorial and Remonstrance Against Religious Assessments and
Thomas Jefferson's
Virginia Statute for Religious Freedom. The great condition of religious liberty is that it be maintained free from sustenance, as also from other interferences, by the state. For when it comes to rest upon that secular foundation it vanishes with the resting. ==Legal scholarship==