Sometimes we can think that once we say “yes” to God all of our troubles are gone. We can believe that we will never suffer, never experience hardship, never be sad. We can reduce our relationship with God to one as with a magician. Magically, everything is always wonderful.
But such is not the promise of a relationship with God. Because of sin in the world, evil is in the world too. Bad things happen to people of faith. There are still martyrs. There are still those who experience injustice. What God promises is that we are never alone. And once we realize that, we are happy indeed.