The secret things of God are not to be scrutinized, and those which he has revealed are not to be overlooked, lest we may, on the one hand, be charged with curiosity, and, on the other, with ingratitude.

John Calvin, Institutes, 3.21.4. quoted by Joel R. Beeke, Debated Issues in Sovereign Predestination: Early Lutheran Predestination, Calvinian Reprobation, and Variations in Genevan Lapsarianism, 95.