to me, you know what's the best, straight forward and
logical way to repent for slandering the dharma?
do the opposite of slandering. that mean promote back the Dharma
you slander. just like what Vasubandhu did.
VASUBANDHU'S CONVERSION
"Asanga, teacher of the Law [Dharma], saw that his younger
brother was endowed with an intelligence surpassing that of others,
his knowledge being deep and wide, and himself well-versed in
esoteric and exoteric doctrines. He was afraid that the latter
might compose a sastra and crush the Mahayana. He was
living then in the land of the Hero (Purusa-pura) and sent a
messenger to Vasubandhu in Ayodhya with the following message: "I
am seriously ill at present. You had better attend to me quickly."
Vasubandhu followed the messenger to his native land, saw his
brother and inquired what was the cause of his illness. He
answered: "I have now a serious disease of the heart, which arose
on account of you." Vasubandhu again asked: "Why do you say on
account of me?" He answered: "You dot no believe in the Mahayana
and are always attacking and discrediting it. For this wickedness
you will be sure to sink forever in a miserable Life. I am now
grieved and troubled for your sake to such an extent that my life
will no long survive. On hearing this Vasubandhu was surprised and
alarmed and asked his brother to expound the Mahayana for him. He
then gave him a concise explanation of the essential principles of
the Mahayana. Thereupon the Teacher of the Law (Vasubandhu), who
was possessed of clear intelligence and especially of deep insight,
became at once convinced that the truth of the Mahayana excelled
even that of the Hinayana.
"He then fully investigated, under his brother, the principles
of the Mahayana. Soon after he became as thoroughly acquainted with
the whole as his brother was. When its meaning was already clear to
him, he would meditate on it. From the beginning to the end
everything was perfectly in accordance with the truth, there being
nothing contradictory to it. For the first time he realized that
the Hinayana was wrong and the Mahayana right. If there were no
Mahayana, then (he thought) there would be no path (marga)
and no fruition (phala) of the Tri-yana [Three Vehicles].
Since he formerly did harm by speaking ill of the Mahayana, in
which he then Bodhisattva Vasubandhu
had no faith, he was now afraid that he might fall into a miserable
life on account of that wickedness. He deeply reproached himself
and earnestly repented of his previous fault. He approached his
brother and confessed his error, saying: 'I now desire to make a
confession. I do not know by what means I can be pardoned for my
former slander.' He said (further): 'I formerly did harm speaking
ill (of the truth) by means of my tongue. I will now cut out my
tongue in order to atone for my crime.' His brother answered: 'Even
if you cut out your tongue a thousand times, you cannot wipe out
your crime. If you really want to wipe out your crime, you must
find some other means.' Thereupon he asked his brother to explain
the means of wiping out the offence. The latter said: 'Your
tongue was able to speak very skillfully and effectively against
the Mahayana, and thus discredit it. If you want to wipe out your
offence, you must now propound the Mahayana equally skillfully and
effectively.'" (The Life of Vasubandhu, J.
Takakusu, tr., pp. 290-292) http://online.sfsu.edu/rone/Buddhism/Buddhism/BuddhistDict/BDV.html
that mean what used to be a disbelieve had turn into a strong
believe in it. that's already 忏悔!
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