“What you see is what you get.” This is true of God and should be true of believers. Satan, however, is a deceiver (Revelation 20:8-10). He also lies, murders, steals, and destroys, but these deeds are just weapons in his arsenal. Satan’s chosen method is deception and his goal is taking as many people to hell with him as he can. He hates God, his throne, his angels, and his saints. This is why Satan loves to appear as an “angel of light” (2 Corinthians 11:14).
Satan doesn’t “stand in the truth because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it” (John 8:44). However, lies are just a weapon. Satan twists the truth in order to deceive. If people believe his lies, then they’ll ignore the gospel, reject Jesus Christ, and join Satan in hell. “Whoever loves and practices a lie” can’t enter the New Jerusalem (Revelation 22:15). Satan’s greatest lie is the anti-Christ. Those who don’t believe and “receive the love of the truth” but have “pleasure in unrighteousness” will be deceived into accepting the anti-Christ and then condemned to hell (2 Thessalonians 2:9-12).
Jesus Christ is true and he embodies truth (John 14:6, Revelation 19:11). Do we believe, love, receive, and “walk in truth” (3 John 4)? If not, then we must repent.
 New King James Version (NKJV), unless otherwise noted