Praise that comes from the heart isn't flattery or empty sweet talk. It may serve as encouraging and complimentary speech. But there are some who like flattery and excessive praise, who only want to hear about good things. False speech is when people try to butter you up saying only what you want to hear. Hearing such things feels nice at the time, but it is not beneficial at all. However, it depends on the attitude. Praising or complimenting someone with respect brings people closer together and helps break the ice, which is different from frivolous speech.
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