In Matthew 24:35-36, Jesus says, "Heaven and earth will pass away, but my words will never pass away. But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father." This passage emphasizes the eternal and unchanging nature of Jesus' words, even in the face of the temporary and fleeting nature of the world. It also acknowledges the mystery surrounding the exact timing of future events, which is known only to God the Father.