He died for you. And He did it all because He loves you. God responded to the greatest need, our sin, by giving the greatest Person, Jesus Christ, to make the greatest sacrifice, His death, in order to give us the greatest gift, eternal life. God gave Jesus. This is what is called the Gospel.
Gospel means good news.
Those of us who have experienced the effects of this good news in our lives also know the gratitude we feel toward God. Surely human words fail to adequately express the overwhelming gratitude which wells up in our hearts. On the other hand, those who do not know Jesus Christ may not feel that gratitude. They may see the world as a dark place, full of foreboding and despair. Unless we have been touched by God, we probably will never be truly grateful for anything.