Jesus said that his words are the words of God. Jesus said that his words came directly from God.
This is what Jesus said about his own words:
“For I did not speak on my own, but the Father who sent me commanded me to say all that I have spoken. I know that his command leads to eternal life. So whatever I say is just what the Father has told me to say.” (John 12:47-50)
“Heaven and earth will pass away, but my words will never pass away.” (Matt 24:34-36; Mark 13:30; Luke 21:33)
“It is the spirit that gives life; the flesh is useless. The words that I have spoken to you are spirit and life.” (John 6:63)
Jesus' words can be relied on. They are truly the words of God. They will never pass away. They are spirit and life.
However Jesus doesn't just want us to listen to his words. He wants us to act on them:
I will show you what someone is like who comes to me, hears my words, and acts on them. That one is like a man building a house, who dug deeply and laid the foundation on rock; when a flood arose, the river burst against that house but could not shake it, because it had been well built. But the one who hears and does not act is like a man who built a house on the ground without a foundation. When the river burst against it, immediately it fell, and great was the ruin of that house." (Luke 6:47-49)