Because it is written, Be ye holy; for I am holy. – 1 Peter 1:16

Let us be very watchful against all impurity. Anything like uncleanness in a Christian will soon send the Master away from the church. You know what it was that brought the evil upon the house of Eli. It was because his sons made themselves vile even at the tabernacle door. The young people in that case were the immediate cause of the mischief, but it was the fault of the elder ones that they restrained them not. Watch against all evil passions and corrupt desires. Be ye holy even as your Father which is in heaven is holy.

And then, again, a want of prayer will send Him away. There are members of some churches who never come to the prayer-meetings, and I should be afraid that their private prayers cannot be any too earnest. Of course we speak not of those who have good excuse; but there are some who habitually and wilfully neglect the assembling of themselves together; these are worthy of condemnation. Oh, let us continue a prayerful church as we have hitherto been, otherwise the Master may say, “They do not value the blessing, for they will not even ask for it; they evidently do not care about My Spirit, for they will not meet together and cry for Him.” Do not grieve Him by any such negligence of prayer.

So, too, we may grieve the Spirit by worldliness. If any of you who are rich get to imitate the fashions of the world and act as worldlings do, you cannot expect the Lord to bless us. You are Achans in the camp, if such is the case. And if you who are poor get to be envious of others and speak harshly of others to whom God has given more substance than to you, that again will grieve the Lord…Let me ask you to be more in prayer; let me pray you to live nearer to Him; let me entreat you for the church’s sake, and for the world’s sake, to be more thoroughly Christ’s than you ever have been and may the power of the Holy Spirit enable you in this. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1035.cfm