Testimony is a declaration of the things you have come to know through he who testifies of all truth, the Holy Ghost.
Doctrines studied and practiced with the hope that they are indeed God’s word allows us the gift of the Spirit, who testifies to us, strengthening our testimony. This process is known as faith: Hope that some thing’s real, act upon what you know, receive a witness that the thing you hoped for is true.
I know this to be true. By simply following the doctrine, we’ll know it through the spiritual, deep rooted proof that only the Holy Ghost can provide.