[inofindy]

hi

my impression was there are four dharma seals in Mahayana (athought some Mahayana traditions say three)

to have impermanence without unsatisfactories will not result in Nirvana, given the mind must have dispassion to reach Nirvana

if impermanent things are simply impermanent, like a car you can simply trade for another car, then discernment of impermenance will not result in Nirvana

this is the same as believing in rebirth. if one truely believes in rebirth then believing in impermanence is not important because we simply trade in one life for another life. this is why rebirth does not lead to Nirvana.

there must be the discernment of the unsatisfactoriness of impermanent things for dispassion & Nirvana to occur

thus, four dharma seals are better than three, just like $4 is better than $3

regards