Many, content with their honesty, speak just as they like at the moment. They do not mind what effect it will produce as long as they are sure that what they say is true. The truth that strikes like a hammer on the head of the listener is not desirable, one would be better off without it. This shows that it is not only a thing to consider that what one says is true, there is another consideration which is most necessary, and that is what effect it will make on the other. ... The complete spiritual life is not a dreamy one, but wide-awake, full of thought and consideration.
The word has a magic in it, it can turn friends into your enemies, and it can make your enemies your friends. The mystery of all success in every direction of life is in the word. The word has power to turn the mind of the listener warm or cold. The word can produce the effect of earth, water, fire, air, or ether. The word can produce depression or joy. The one who knows the chemistry of the word does not need drugs or herbs. He has medicine for every disease in the world, not only for bodily disease, but also for the disorders of the mind, which still remain unexplored by science. By a constant study of life, by special thought given to one's word, by careful watching of the effects of one's speech upon others, one arrives at a state of realization where one can heal hearts.
from
https://wahiduddin.net/mv2/XIII/XIII_6.htm
