Why is that in there?

"Call upon Me and I will answer you, and show you great and mighty things, which you knowest not"Jeremiah 33:3.Sometimes some of the promises in the Bible take a lot of faith to believe.But guess what? This verse is so true,I've seen it firsthand. People literally on death's door,restored,miraculously as a result of prayer(calling upon Him). A believer's home preserved untouched in the midst of a hurricane which damaged and destroyed much property all around. Yes, people called upon The Lord.I could relate many other instances of direct answers to calling upon The Lord,people shown amazing mercy, medical issues being healed, people feeling the presence of God on and all around them,all a result of calling upon Him.Great and mighty things? FOR SURE,I believe that promise, I KNOW it to be true. Wait a minute, if THAT one is true, could it be that the other promises in the Bible are too? Could it be? ABSOLUTELY, POSITIVELY!