1 John 2:20-21, “But you have an anointing from the Holy One, and all of you know the truth. I do not write you to you because you do not know the truth, but because you know it and because no lie comes from the truth.”

Interesting points:
1. In contrast with the false teachers described in 2:18–19, John reassures true believers reading this letter that they have been both anointed and possess knowledge of the truth. This anointing referred to the Spirit of God being poured out by Jesus -- the Holy One -- on those who have come to faith in Christ. In 1 John 2:27, he tells us “the anointing you received from Him remains in you", meaning it is lasting/enduring.

2. Jesus is called “the Holy One” in Revelation 3:7, and Peter uses this term for Him in John 6:69 and Acts 2:27, Paul refers to Him as such in Acts 13:35, the angels in Revelation 16:5, and even evil spirits in Mark 1:24 and Luke 4:34. Acts 4:26-27 describes Jesus as the Anointed One and in turn, we see in Verse 20 that Jesus anoints those who believe in Him.

3. The concept that all of us believers "know the truth" refers to our knowledge that Jesus is the Christ, and by making the decision to accept as Lord of our lives, we gain salvation. It follows that those reading this letter have this knowledge (and belief) in the truth, meaning they are not antichrists. Truth is something a believer knows, not simply factual information, but knowledge that is accepted and applied. This, in fact, is faith: more than mere agreement, it is trust and Verse 21 emphasizes the biblical view of truth: truth exists and its opposite is false. This contrasts with other viewpoints/beliefs/approaches to truth which deny this, claiming that opposites can both be true, or that there is no "real" truth. According to the Scriptures, this is not the case. There is one, and only one, "real" truth!

4. John follows with the clarification that truth and lies are in opposition to one another. This verse repeats the theme of 1 John 1:6 that living sinfully while claiming fellowship with God is a heinous lie.
Application.
Brothers, how do we view truth? Do we buy into the World’s view of truth with such popular exhortations to “speak your truth” (tell of your perspective, experience, state your opinion) or do we frame what we say and do around “the Truth” which John 14:6 helps us understand is our Lord Jesus, who being the Truth, sets us free (John 8:32)?

If no lie comes from the Truth, then that means God fulfills all His promises (in His way). What implication does that have for us believers as we live our lives and fulfill His purpose in our lives. As we contemplate this today, what is God revealing to you today about how you can better step out in faith?