Why Witnessing and Testimonies Don't Work

"Let me give you my testimony."
This phrase is often heard in casual conversations when those conversations turned to spiritual matters. Often it is used as a way to introduce the person offering the testimony, or at least introduce their spiritual side.
It's also not Biblical or logically meaningful to do so.
== What Is A Personal Testimony ==
"Giving your personal testimony is a way to share the gospel with others by explaining your personal salvation experience. It gives others an example of how God changes lives. It is one of the most effective means of sharing your faith because, although a person can try to refute that Jesus alone offers salvation, they cannot refute the fact that you’ve found reason to place your hope in Christ." From - the BSU Christian Challenge, New Mexico State University.
Scriptural references are often given. John 4:39; Acts 8:25; 18:5; 23:11; 28:23; 1 Cor. 15:15; 1 Thess. 4:6; John 21:24; Rev. 1:2 and many more. In fact, it seems like with all these scriptural references of testifying and testimonies and talk of witnesses that those who practice this today have a pretty solid case.
However, this is far from the truth.
== What The Bible Says About Witnesses and Testimonies ==