1 Peter 1:24–25
 For “All flesh is like grass and all its glory like the flower of grass. The grass withers, and the flower falls,  but the word of the Lord remains forever.” And this word is the good news that was preached to you. (ESV)
One of the things that we see in nature is the constant changing of the seasons. The grass grows. It may even become hay if we don't bother to cut it. After the summer season comes to an end the grass begins to wither. What was once lively and green becomes wilted and brown. Things fade away and even die. As beautiful as the flowers are they have a shelf life.
Mankind is likened to the grass and the flowers. We grow, we bloom, we fade, and we fall. Ultimately we will die. Everything about our earthly existence is temporal, and headed for death. This is a sobering thought. Those who put all of their hope in things of this earth are putting their hope in something that will eventually be destroyed.
The word of the Lord is not like mankind. It is also not like the things of this earth; grass and flowers. God's word is eternal. It remains forever. It does not die. It does not even fade. There is a consistency to the truth that we find in what God says. If he makes a promise he keeps it. If he tells us he loves us he means it. We question the truth of what man can say, but we know that God always speaks truth.
I love the last phrase of verse 24: "And this word is the good news that was preached to you." The good news that you heard was not from man. If it was it could not be trusted as being eternal, unchanging, remaining forever. The good news that you heard came from God. He is the source of eternal truth. His word remains forever. If you have received the gospel you have received something that remains forever!
Take a moment and thank God for the good news that you have received. Praise him because his word remains forever. Ask the Lord to help you not to put your trust in things that fade and fall.