"And Moses said unto God, Behold, when I come unto the children of Israel, and shall say unto them, The God of your fathers hath sent me unto you; and they shall say to me, What is His name? what shall I say unto them? And God said unto Moses, I AM THAT I AM: and He said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you" (Exodus 3:13-14).
"The LORD is righteous in all His ways, and holy in all His works" (Psalm 145:7).
The "Who" and "What" of God perfectly and eternally align. Our Lord never acts in opposition to His righteousness and holiness, thus establishing the basis of our confidence, and the reason we can safely "trust in the Lord with all thy heart" (Proverbs 3:5; emphasis added). Without reserve, the convicted sinner can come to the Lord Jesus Christ in full assurance that "by grace are ye saved through faith" (Ephesians 2:8). Moreover, the converted saint can walk with God in full assurance of empowerment to a life of faithful godliness as the indwelling Spirit of Christ fulfills His sublime promise, "I will dwell in them, and walk in them" (II Corinthians 6:16).
In no one else can we trust "with all thy heart." Certainly, we all know consistently faithful and trustworthy people, that is, those devoted to a life of responsibility to God and others. We give thanks for such noble hearts. We do not, however, expect perfection from anyone other than the Lord. He alone will always be who and what He is, and He alone will always act in the pristine perfection that originates in His character, nature, and person. "Know therefore that the LORD thy God, He is God, the faithful God" (Deuteronomy 7:9).
There is Someone to trust. There is Someone who will be tomorrow who He is today, and who will be today who He was yesterday. There is Someone to whom we can vouchsafe our hearts with complete and utter abandon. There is Someone whose every promise will be fulfilled, and whose every word is spoken in truth. There is Someone whose heart always guides His hand, and whose hand always fulfills the intentions of His heart. There is the God and Father of our Lord Jesus Christ, the faithful God. Yes, we can entrust time and eternity to Him, and we can entrust to Him this moment, whatever it may hold. Because no one has ever trusted in this, the faithful God, and been disappointed for doing so. And no one ever will.
"And I saw heaven opened, and behold a white horse; and He that sat upon him was called Faithful and True."