He has given us understanding into what is true

“And we know that the Son of God has come and has given us understanding, so that we may know him who is true; and we are in him who is true, in his Son Jesus Christ. He is the true God and eternal life.” (1 John 5:20 ESV)

True: being in accordance with the actual state or conditions; conforming to reality or fact; not false: dead on target, truthful, dependable, honest, reliable, genuine, unfeigned, lawful, on-key, straight, rightful.

God’s judgements are true and righteous altogether

“The fear of the LORD is clean, enduring forever; The judgments of the LORD are true; they are righteous altogether.” (Psalm 19:9)

Keep your mind on whatever things are true

“Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.” (Phil. 4:8 KJV)