Here are 4 Bible verses about overthinking from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Proverbs 30:25 KJV
The ants are a people not strong, yet they prepare their meat in the summer;
2 Timothy 2:7 KJV
Consider what I say; and the Lord give thee understanding in all things.
Genesis 6:17 KJV
Consider what I say; and the Lord give thee understanding in all things.
Ecclesiastes 5:3 KJV
And, behold, I, even I, do bring a flood of waters upon the earth, to destroy all flesh, wherein is the breath of life, from under heaven; and every thing that is in the earth shall die.