Nichiren too, "always smiling and cheerful"?

"Regarding the phrase, 'delight the hearts of the assembly,' Jose Toda, the second Soka Gakkai president, said: 'When we practice faith in earnest for 10 years, our lives become truly pure. Our skin, the look of our eyes, our actions all become soft and pure, and yet come to possess a certain dignity. This is the benefit of the Gohonzon. When this happens we feel delight in our hearts; this is the meaning of "delight the hearts of the assembly.'

Since those who attain this state of life are always bright, they cannot help but feel joy. Such people are happy and, therefore, always smiling and cheerful; if they should go into business, they are sure to prosper. That's because others think, "If I'm going to buy the same item anyway, then I might as well go and buy it from that person." This is what 'delight the hearts of the assembly' means." -- Daisaku Ikeda