7 It is for discipline that you have to endure. God is treating you as sons. For what son is there whom his father does not discipline? 8 If you are left without discipline, in which all have participated, then you are illegitimate children and not sons. 9 Besides this, we have had earthly fathers who disciplined us and we respected them. Shall we not much more be subject to the Father of spirits and live? 10 For they disciplined us for a short time as it seemed best to them, but he disciplines us for our good, that we may share his holiness. 11 For the moment all discipline seems painful rather than pleasant, but later it yields the peaceful fruit of righteousness to those who have been trained by it. Hebrews 12:7–11, ESV
Only a fragment of the visible Church is holy. Only a Remnant is truly saved. There is actually a great gulf fixed between this Remnant and professing Christians who are in apostasy and/or unbelief. This gulf has many aspects, but one of the main things that separate the two groups is that the Remnant is made up of those who are true worshippers of God. They worship the Father in spirit and truth. Those in apostasy may very well have stirring worship services and sing praise song after praise song in their “Sunday Worship Services,” but that is as far as it goes. It is simply music, and in God’s ears it is nothing more than a clanging gong. Genuine worship of God in spirit and truth comes from the heart of the regenerate who worships Him with every part of their lives. They serve God in all they do. He is their all-in-all. They do not seek for God to make them happy in all things. Instead, they seek to walk holy before the Lord.