I sometimes wonder how much time I have wasted, and how much energy I have spent worrying about things which never came to pass, or things I could never change. Looking back, worry hasn't accomplished one positive thing in my life. Looking forward, I pray that the Lord will strengthen me in my faith through His Word so that I can trust Him even in life's darkest hours. In the midst of the ups and downs of daily living one thing is certain, God never changes. He will always be as He has always been, which means that I can always depend upon His faithfulness. Theologians call this "immutability." I call it peace. The peace which comes in knowing that Jesus Christ is the same yesterday and today and forever (Hebrews 13:8). John Newton said, “We can easily manage if we will only take, each day, the burden appointed to it. But the load will be too heavy for us if we carry yesterday’s burden over again today, and then add the burden of the morrow before we are required to bear it.” Jesus put it this way, "Take therefore no thought for tomorrow: for tomorrow shall take thought of the things sufficient of itself. Sufficient unto the day is the evil thereof" (Matthew 6:34).
Psalm 55:22 Cast thy burden upon the LORD, and he shall sustain thee: he shall never suffer the righteous to be moved.
Additional thought taken from William MacDonald’s Believer’s Bible Commentary:
“Worry is unnecessary; there is no need for us to bear the burdens when He is willing and able to bear them for us. Worry is futile; it hasn’t solved a problem yet. Worry is sin. A preacher once said: ‘Worry is sin because it denies the wisdom of God; it says that He doesn’t know what He’s doing. It denies the love of God; it says He does not care. And it denies the power of God; it says that He isn’t able to deliver me from whatever is causing me to worry."