James Chapter 1 Verses 16-20...

16 Do not be deceived, my beloved brothers and sisters. 17 Every good thing given and every perfect gift is from above, coming down from the Father of lights, with whom there is no variation or shifting shadow. 18 In the exercise of His will He gave us birth by the word of truth, so that we would be a kind of first fruits among His creatures.

19 You know this, my beloved brothers and sisters. Now everyone must be quick to hear, slow to speak, and slow to anger; 20 for a man’s anger does not bring about the righteousness of God.

Verse 16:

To be deceived means to not err according to what I have read and researched.

Or put another way do not sin.

9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither the sexually immoral, nor idolaters, nor adulterers, nor homosexuals, 1 Corinthians 6:9

Verse 17:

God is not sin and cannot make us sin. God cannot make us err.

Only good things can come from God, not anything unholy or evil, so this verse is talking about all the good things that are from God and they come from heaven because that is where He resides.

The shifting shadows is talking about evil.

3 Jesus responded and said to him, “Truly, truly, I say to you, unless someone is born [a]again he cannot see the kingdom of God.” John 3:3

Verse 18:

Some versions say begot or brought the word of truth.

The word of truth is the everlasting gospel and the holy spirit.

The second part of this verse talks about using the example of crops and that in the times of the Bible, they gave their fruits crops to God as a sacrifice, so we are to do the same (what we get the first goes to God). 

13 who were born, not of blood, nor of the will of the flesh, nor of the will of a man, but of God.

Verse 19:

Put in the KJ21 says, 19 Therefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath; 

We are to be swift to hear, slow to speak, and to have anger or wrath.

21 But He was speaking about the temple of His body. John 2:21

Verse 20:

The wrath of man does not work or bring about the righteousness of God. 

Some versions say work or worketh or promote.

This means our wrath does not promote God's righteousness. 

22 But I say to you that everyone who is angry with his brother shall be answerable to the court; and whoever says to his brother, ‘You good-for-nothing,’ shall be answerable to the supreme court; and whoever says, ‘You fool,’ shall be guilty enough to go into the fiery hell. Matthew 5:22