What we say plays a major role in the life of every believer.  The phrase "You have what you say" is so true.  The Word of God is very clear on the power of our word and what we say.  Proverbs 18:21 says "Life and death are in the power of the tongue".  Proverbs 6:2 says "We are snared by the words of our mouth.  We are taken with the words of our mouth.  That's powerful!  Jesus said in Mark 11:23 at the end of the verse, "He shall have whatsoever he saith".  So you see, what we say does make a huge difference in our lives.  Someone once said that as long as I believe it, that's all that matters.  But that's not what the Word of God teaches.  The Word teaches us that we have to say what we believe.  Let's look at II Corinthians 4:13.  It says, "We having the same Spirit of faith, according as it is written, I believe, and therefore have I spoken". We also believe and therefore speak.  Notice it doesn't say "We having the same Spirit of faith, believe".  It says "We having the same Spirit of Faith, BELIEVE and SPEAK".  Its not enough to just believe.  We have to speak what we believe.  Because by speaking what we believe, we are able to change any situation we may be facing in life.  If we would speak the Word, or what God says, about any situation; we will see victory every time because it's true, we have what we SAY!