Expressing what is logical and intelligible is quite acceptable...
Expressing what is logical and intelligible is quite acceptable, but expressing unintelligible things has these harmful effects: a) Emphasis on the expression regardless of what the content may be; b) Useless, irrelevant speeches being sympathetically delivered to people only because the speaker considers them important; c) A chance for people to use futile speeches for their own personal aggrandizement; d) Interesting, amazing information given without having any effect on the reader.
Expressing realities useful to man - whether physically or spiritually - is not only free, but refusing to express them can be a crime. Freedom of expression faults only when it causes disorder in all true human principles and values and misguides minds.
If man were so mentally developed that he would not only tell only the truth, and provide both the speaker and the listener with effective information and sufficient expressions, there would be no problem at all with the absolute freedom of speech - but is it truly so? Are today's Eastern speakers, listeners, and researchers all as great as Abu-Reihan Biruni, Avicenna and Farabi in philosophy, or Muhammad Mehdi Naraqi and Sheikh…