In Amos 6:12 we read, “Shall horses run upon the rock? will one plow there with oxen? for ye have turned judgment into gall, and the fruit of righteousness into hemlock.”
Israel had become very evil. They worshipped idols at the same time that they gave sacrifices to God. They did all sorts of evil in the name of other gods. The rich had no sympathy for the poor. In fact, they were always looking for another way to make the poor poorer. All they could think about was making more money.
God is saying that these evils were spiritual rocks. Just as a farmer would never try to plow a field full of rocks, the worshipper of God cannot live for God if all he is plowing is evil rocks. Proper seeds cannot be planted. Proper plowing cannot be done. Fruit cannot be produced if our spiritual field is full of rocks.
Through Amos, God was condemning Israel. He was telling them that because of their sins, he was going to severely punish them. Nothing would change his mind. He was tired of their consistent and persistent sinning.
Do not try to spiritually plow rocks with oxen. Study your Bible. Learn how to properly serve God. And if any of this is hard to understand, ask an adult to help you.