Closing one’s eyes comes naturally, especially while chanting a mantra.
However, one needs to watch out against this natural reflex while chanting NamMyoHoRengeKyo.
NamMyoHoRengeKyo (NMHRK) seems to be about connection and spreading outwards, such being the need of the hour.
Closing one’s eyes while chanting NMHRK causes vibration to accumulate in the area of the main chakra between the eyebrows.
In most of us, living in today’s day and age, this main chakra is closed or party open only, due to our lifestyles, myself included.
In very few is this chakra fully open, due to the maintenance of a healthy and spiritual lifestyle.
Closing one’s eyes for longish periods while chanting NMHRK with a closed or only partially open main chakra between the eyebrows can cause harm to this chakra.
In extreme cases, where NMHRK is chanted vigorously for long periods with closed eyes, this chakra could even explode.
Harm to the main chakra between the eyebrows affects all chakras in the body, since the main chakra has a controlling effect on all of these.
Ill-functioning chakras lead to ill-health and abnormal development in the body.
Thus it makes complete sense to chant NMHRK with eyes open.