The NIV New Testament and NKJV New Testament are translations based on the principle that an older ancient Greek manuscript is more reliable than a younger ancient Greek manuscript.  However, as is easily proved and as we have proved elsewhere, this principle of “greater age priority” is unreliable.  This means that the NIV New Testament and NKJV New Testament are unreliable.  This, in turn, means that the NIV and NKJV are unreliable.