I’ve asked that question many times. You look at something and wonder if it’s good or not. Many things look good on the outside but are garbage. In Matthew 7:15-21, Jesus talks about false prophets. He gives the example of a fruit bearing tree. Jesus said you will know them by their fruits. If you remember, Jesus and the disciples were walking into Jerusalem. He was hungry and stop at a tree that would normally have fruit on it. There was none. He cursed the tree. The next day, they passed by again and the tree was dead. Jesus explained the same narrative. This is why it is so important for us as Christians to live the life before man. Because a person is known by the fruit that they produce. And beware that there are false prophets out there. But the word of God is true and will produce fruit in you life. And people are always looking for the right fruit.