Truth
Truth is saying what is so. Not what helps. Not what soothes. What is so.
Telling it costs something. A record that bends to comfort fails the next person who reads it.
To say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true.
Say what you saw. Write it down as it happened. Correct it when you learn more.