in most cases yes but if it is absolutly nessesary then its ok but it should be for the right reasons and not to just benifit yourself.
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)
We would quickly have no friends.
A necessary truth is a statement that is true in all possible circumstances. An example of a necessary truth is "224." This statement will always be true, regardless of any circumstances or conditions.
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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.
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
No. In some cases there are no witnesses.