John Calvin said this quote

Those who set up a fictitious worship, merely worship and adore their own delirious fancies; indeed, they would never dare so to trifle with God, had they not previously fashioned him after their own childish conceits.

~ John Calvin

The whole world is a theatre for the display of the divine goodness, wisdom, justice, and power, but the Church is the orchestra, as it were—the most conspicuous part of it; and the nearer the approaches are that God makes to us, the more intimate and condescending the communication of his benefits, the more attentively are we called to consider them.

~ John Calvin

In a way, the futile excuses many people use to cover their superstitions are demolished. They think it is enough to have some sort of religious fervor, however ridiculous, not realizing that true religion must be according to God's will as the perfect measure; that He can never deny Himself and is no mere spirit form to be changed around according to individual preference.

~ John Calvin

Were the judgments of mankind correct, custom would be regulated by the good. But it is often far otherwise in point of fact; for, whatever the many are seen to do, forthwith obtains the force of custom. But human affairs have scarcely ever been so happily constituted as that the better course pleased the greater number. Hence the private vices of the multitude have generally resulted in public error, or rather that common consent in vice which these worthy men would have to be law.

~ John Calvin