Final answer:
The power of judicial review is the device that restrains government power but is not expressly stated in the Constitution; it was established after the Constitution was written and was predicted by Alexander Hamilton.
Step-by-step explanation:
According to the text, the device used to restrain the power of government that is not expressly stated in the Constitution is the power of judicial review. This was established early in the nation's history and was foreseen by Alexander Hamilton in Federalist 78.
The Constitution outlines various limits on government power, such as no bills of attainder or ex post facto laws, but the concept of judicial review, while a fundamental aspect of constitutional law today, was not directly included in the constitutional document.