John 3:33 (amplified) "Whoever receives His testimony has set his seal of approval to this: God is True. [That man has definitely certified, acknowledged, declared once and for all, and is himself assured that it is Divine Truth that God CANNOT lie.]
This verse started me on a journey today. I began looking up verses that refer to the impossibility of God lying. After all, Chapter 3 of John, Jesus says thrice, "I tell you the truth" (vv 3, 5, 11).
The first Scripture that popped into my head was John 17:17: "Sanctify them by the Truth; Your Word IS Truth!" Then John 14:6: " I AM the Way and the Truth and the Life..."
After that I went to the concordance and looked up lying in reference to God and found:
Numbers 23:19(amp.) "God is not a man that He should tell or act a lie..."
1Samuel 15:29(amp.) "And also the Strength of Israel will not lie or repent..."
Titus 1:2(NIV) "a faith and knowledge resting on the hope of eternal life, which God, Who DOES NOT LIE, promised before the beginning of time"
Hebrews 6:18(amp.) "This was so that, by two unchangeable things [His promise and His oath] in which it is impossible for God ever to prove false or deceive us (i.e. LIE), we who have fled [to Him] for refuge might have mighty indwelling strength and strong encouragement to grasp and hold fast the hope appointed for us and set before [us]."
His COMPLETE truthfulness means EVERY Word He has spoken is true. NOT just the ones that are easy to believe. ALL OF THEM!!! WOOHOO!!!
The next verse in the Hebrews passage is the challenge in light of KNOWING that God will not lie and will keep His promises (every last one - 2Corinthians 1:20).
Hebrews 6:19 (amp.) "[Now] we have this [hope] as a sure and steadfast anchor of the soul [it cannot slip and it cannot break down under whoever steps out upon it--a hope] that reaches farther and enters into [the very certainty of the Presence] within the veil..."
My paraphrase of this is: "So STEP OUT in faith Woman! The ice is 4 billion feet thick and entirely safe. BELIEVE!!!"