Here is a section from John Calvin’s sermon on I Corinthians 11:17-19.
It is necessary to consider why the Lord wishes that the Church congregate, that there be a certain place, that there be a sanctuary designated for the invocation of his name and the preaching of his word….There must be some goal in order that whatever God has established among us may serve and be useful for our salvation. No one should return home without having gotten some good from the worship service…we come here to hear the word of God, we offer prayers for and with each other and we partake of the sacraments. Afterwards, each one of us in our own home will have some idea of what to do to manifest our Christianity. We must by no means think ourselves acquitted before God because we have heard the sermon each week, prayed in the company of believers, professed our faith, and participated in the sacraments. We must not, I say, be beguiled into thinking that God is altogether satisfied if we do those things, but we must consider their end and their utility, profiting by being daily confirmed in the fear of God and by the increase of our faith. In brief, we must show that it is not in vain that we have been to the school of our God, for it is indeed a profanation of the doctrine we hear if we continue in the same condition as formerly.
[Later he says]: This is an exceedingly great and intolerable vice. The result is that we assemble in worship and our lives do not show any semblance of improvement. We act as if we had never heard a single word, had never been instructed in the will of God. If we differ in no respect from those misfortunates who have received no instruction, do we not thereby show that we scorned God every time we come the sanctuary in his name? It is flagrant hypocrisy and duplicity to claim that it is to offer ourselves sacrificially to God when we come to hear his word and yet depart without having been edified by it.