Nichiren on happiness with commentary

"And when you are happy you should remember that your happiness in this life is nothing but a dream within a dream, and that the only true happiness is that found in the pure land of Eagle Peak, and with that thought in mind, chant Namu-myoho-renge-kyo." -- Nichiren

Commentary:

And when you are unhappy, you should remember that your unhappiness in this life is nothing but a dream within a dream, and that the only true happiness is that found in the pure land of Eagle Peak, and with that thought in mind, chant Namu-myoho-renge-kyo.

Compare this with SGI's teachings on happiness and unhappiness:

http://laureldistrictstudy.homestead.com/files/Bodiacs_LJGuidance_for_29_Sept_01_pdf.pdf