1 Samuel 17:49-50

17:49 David reached his hand into the bag and took out a stone. He slung it, striking the Philistine on the forehead. The stone sank deeply into his forehead, and he fell down with his face to the ground.

17:50 David prevailed over the Philistine with just the sling and the stone. He struck down the Philistine and killed him. David did not even have a sword in his hand.

Psalms 33:16-17

33:16 No king is delivered by his vast army;

a warrior is not saved by his great might.

33:17 A horse disappoints those who trust in it for victory;

despite its great strength, it cannot deliver.

Ecclesiastes 9:11

Wisdom Cannot Protect against Seemingly Chance Events

9:11 Again, I observed this on the earth:

the race is not always won by the swiftest,

the battle is not always won by the strongest;

prosperity does not always belong to those who are the wisest,

wealth does not always belong to those who are the most discerning,

nor does success always come to those with the most knowledge –

for time and chance may overcome them all.

Jeremiah 9:23

9:23 The Lord says,

“Wise people should not boast that they are wise.

Powerful people should not boast that they are powerful.

Rich people should not boast that they are rich.

Zechariah 4:6

4:6 Therefore he told me, “These signify the word of the Lord to Zerubbabel: ‘Not by strength and not by power, but by my Spirit,’ says the Lord who rules over all.”