Only speak to those things you have personally experienced.
This requires some flushing out. What is meant by this precept, is to avoid stating “facts,” if we are unsure, or have no direct evidence or experience ourselves. Spreading someone else’s truth isn’t something profound, and often leads to a cult like demeanor. Our lives must be spent finding our truth through direct experience. This doesn’t mean to say that we don’t trust others, or studies, but that when we address spiritual topics specifically, we speak to what we know and avoid conjecture.
To reiterate, this is not about scientific studies. Most of us do not have access to electron microscopes, and can therefore only rely on science to define specific experiments done.
I am referring to the common problem of people passing other spiritual ideas as their own truth, without trying to find their own personal experience. The spiritual plane is one of direct experience. None of us needs to rely on a master, guru, pastor or teacher. All answers are available to us through spiritual work. Once found, those answers only relay to us, as individuals and are not conferred as truths for all others.
It may seem a slight contradiction that I’m stating a precept (truth), of not relying on another person’s truth. This is a suggestion towards your own truth, a guideline to help everyone find their own truth and nothing more, do not get caught up in legalism on this point.
When we don’t know a thing explicitly, or by experience, but logically we have arrived at a conclusion (based on theory and rational deduction), we should weight the hypothesis correctly.
To weight a hypothesis, we would do so with language such as “I think…”, “maybe it is this way… or maybe not…”, “it seems to me, but I could be wrong.” Being open to error in the providing of a hypothesis clears the air and removes ego.