It is a verse which suggests a blessed future, but it does not promise freedom from struggles. In fact, the message of this verse can be fully understood within its context. In the previous six verses the prophet Jeremiah is telling the people of God how they are to live during their upcoming SEVENTY YEARS OF EXILE!
God is telling us that while we may experience difficulties in life, He will neither forget nor forsake us. His plans do not change when ours do, and His plans are always ultimately for our good. This remains true when our circumstances are most difficult.
D. Jan Storey, LPC