Our Heavenly Father has provided us many times with the testimony of two.
First, the testimony of two nations. The Bible and the Book of Mormon both testify of Christ.
Second, the testimony of two witnesses, such as missionaries that go in pairs of two to testify of Jesus Christ and his restored gospel.
Last of all, he gives individuals two testimonies within themselves, so that the strength of it is not based upon just logic, or just feelings.
"Yea, behold, I will tell you in your mind and in your heart, by the Holy Ghost, which shall come upon you and which shall dwell in your heart." (Doctrine and Covenants 8:2)
When the Holy Ghost testifies of truth to us, it tells us in our minds and hearts--not just one or the other. This way, we can feel the truth, and also understand it.
For those looking for a testimony of the restored gospel, I can testify that you can know of assurety in your mind and in your heart. You can receive the knowledge to understand it, and the peace in your heart that only the gospel brings.
