The second part talks about why it is important to chant nam myo ho renge kyo aloud? Many members have asked this question at various times. I feel that the following guidance explains it very nicely.
"There is another quotation from page 832 of the Gosho, "Never
seek this Gohonzon outside yourself. The Gohonzon exists only
within the mortal flesh of us ordinary people who embrace the
Lotus Sutra and chant Nam-myoho-renge-kyo." As stated in this
Gosho Nam-myoho-renge-kyo exists within us. But for some reason
it is very difficult to manifest Nam-myoho-renge-kyo or we can
not seem to bring it out. That is why we are mere mortals. Then
how can we manifest it in our lives?
We can bring it forth by just vocalizing Nam-myoho-renge-kyo.
You may see cherry blossom and feel how beautiful it is. You
may see a full moon and enjoy the moonlight. You may see a
cockroach and feel disgusted. By seeing these things you feel
these types of life conditions. You may be moved by hearing
beautiful music or be motivated by hearing President Ikeda's
speech on tape. You achieve these through your ears.
You're related to your Gohonzon through vocalization. That
means by chanting Nam-myoho-renge-kyo out loud you bring forth
your Buddhist life force. There is a phrase in the Gosho that
states that your voice brings out Buddhahood. As long as you
chant Daimoku you bring out your Buddhahood. It will explode
from you. If you are conned or robbed your life will burst
with anger. If your life is filled with worries and suffering
you may commit suicide. If you chant Nam-myoho-renge-kyo you
can change life filled with such suffering, anger or poverty
and overcome your problems."