GOD'S WORD® Translation
I thought to myself, "God is going to test humans in order to show them that they are [like] animals."

American Standard Version
I said in my heart, It is because of the sons of men, that God may prove them, and that they may see that they themselves are but as beasts.

Berean Study Bible
I said to myself, “As for the sons of men, God tests them so that they may see for themselves that they are but beasts.”

Douay-Rheims Bible
I said in my heart concerning the sons of men, that God would prove them, and shew them to be like beasts.

English Revised Version
I said in mine heart, It is because of the sons of men, that God may prove them, and that they may see that they themselves are but as beasts.

King James Bible
I said in mine heart concerning the estate of the sons of men, that God might manifest them, and that they might see that they themselves are beasts.

World English Bible
I said in my heart, "As for the sons of men, God tests them, so that they may see that they themselves are like animals.

Young's Literal Translation
I said in my heart concerning the matter of the sons of man that God might cleanse them, so as to see that they themselves are beasts.

Ecclesiastes 3:18 Additional Translations ...