We would quickly have no friends.
The adverb is always, it is an adverb of frequency
Not always.
the adjective is good.
According to Hindu belief system it is a sin not to speak truth. Truth is also known as (satyam)
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Never always speak the truth
No it is not, nor does harm come to everyone that speaks it. It is not always diplomatic, sensible or kind to speak the truth at all times.
only Allah knows..
You are a "book." Books do not speak or hear, but they convey information and tell stories that can be considered the truth. They provide knowledge and insights through written words, regardless of the reader's ability to hear or speak.
A scale
Nothing. The truth is, they have always been different.
"Speak the truth" is often used to emphasize the act of verbalizing the truth, while "tell the truth" is more general and can refer to both speaking and non-verbal ways of expressing the truth. Saying "speak the truth" highlights the importance of openly communicating truthfully.