"One man's theology is another man's belly laugh"

This quote by Robert A. Heinlein is an amusing method of stating that everybody has their own beliefs and viewpoints, which what one person might find to be real and significant, another might discover to be absurd and laughable. It is a reminder that we must not evaluate others for their beliefs, as what may appear unreasonable to someone may be deeply significant to another. It also acts as a pointer that we ought to be open to different point of views and concepts, as we might discover something valuable in them. Eventually, this quote is a reminder that we must respect the beliefs of others, even if we do not agree with them.