Hi Dawnfirstlight and Realisation,
If i'm not wrong, and i may be wrong here, the article referred
to is referring to the short Vajrasattva mantra.
It is said that one may have created the karmas of slandering
the dharma unknowingly as it is a very easy karma to create or the
five uninterrupted karmas from past (lives) etc which will stop you
from taking rebirth in pureland. So it is impt to recite the short
vajrasattva mantra 400,000 with the four powers to purify this
negative karma.
His Holiness Jigme Phuntsok revealed a practice that one can use
to recite this 400,000 mantras.
Hey, Wisdomeye. Yes partly.
When reading Amitabha's 48 vows, it occurred to me that
slandering the Dharma could easily have happened without me
knowing. And also, how would I know if I'd committed the five
heinous crimes in previous incarnations, right? I was
thinking, "Yeah, so how can that be resolved?"
Besides this, I was also confused by what this teacher Nan Huai
Jin 南怀瑾 said. Found it already.
"... 修准提法成就则一概破不了。再说,净土宗往生极乐世界是带业往生,有九品之分,上品上
生、上品中生、上品下生……等,如果是下品下生往生的,连阿弥陀佛都看不到,因为他过去无始以来的业力还没有消除,要到极乐世界花开见佛至不退转地时,业
力才慢慢跟着消。密法也是如此,不仅只早学华严部,换言之,密法的力量更严重了,立刻年华甲苹,乃至恶业也转善业,善业转成大智慧成就。所以虔修此法有这
样的殊胜。"
But I think Sinweiy's answer above, quoting the
Contemplation Sutra/Amitayurdhyana Sutra, has clarified things.