84. This is something the Word teaches in many places, among which are the following:

He who walks righteously and speaks uprightly, who despises oppressions for the sake of gain, who shakes his hands so as not to accept a bribe, who stops his ears so as not to hear of blood money, and shuts his eyes so as not to see evil: he will dwell on high. (Isaiah 33:15-16)

Jehovah, who may abide in Your tabernacle? Who may dwell on Your holy mountain? He who walks uprightly and acts righteously..., who does not slander with his tongue, who does no evil to his companion.... (Psalms 15:1-3ff.)

My eyes shall be on the faithful of the land, that they may dwell with Me; he who walks on a path of integrity, he shall serve Me. He who practices deceit shall not dwell within My house; he who tells lies shall not stand in My presence. At dawn I will cut off all the impious of the land, in order to cut off from the city...all workers of iniquity. (Psalms 101:6-8)

[2] Unless someone is inwardly honest, just, trustworthy and upright, he remains dishonest, unjust, untrustworthy, and not upright. This the Lord teaches in these words:

...unless your righteousness exceeds that of the scribes and Pharisees, you will not enter the kingdom of heaven. (Matthew 5:20) Righteousness exceeding that of the scribes and Pharisees means an inner righteousness, which is the righteousness a person has who is in the Lord.

That he is in the Lord is something the Lord Himself teaches in John:

The glory which You gave Me I have given them, that they may be one just as We are one, I in them, and You in Me, that they may be perfected into a one..., that the love with which You loved Me may be in them, and I in them. (John 17:22-23, 26) It is apparent from this that those people are perfected when the Lord is in them.

Those are the people called the pure in heart who shall see God, and are perfect, even as their Father in heaven (Matthew 5:8, 48).