Jesus told his disciples that they will have trouble in the world but peace in him, because he has conquered the world. In the same way, God will not take away all of our problems, but will give us the grace to overcome them.
Based on John 16:29-33
Jesus' disciples said, ‘Yes, now you are speaking plainly, not in any figure of speech! Now we know that you know all things, and do not need to have anyone question you; by this we believe that you came from God.’ Jesus answered them, ‘Do you now believe? The hour is coming, indeed it has come, when you will be scattered, each one to his home, and you will leave me alone. Yet I am not alone because the Father is with me. I have said this to you, so that in me you may have peace. In the world you face persecution. But take courage; I have conquered the world!’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)