With regard to anger and the Four Power of Confession, Lord Tsongkhapa says: "The master Bhavaviveka states (as already explained) that in the case of both the purification of nonvirtue by the four power of confession and the destruction of roots of virtue by wrong views and malice, the seeds of the virtue or nonvirtue cannot give rise to effects even though they may later meet the with the requisite conditions, just as spoiled seeds will not give rise to sprouts event though they may meet with the requisite conditions.
Moreover, as already explained, even though you cleanse your accumulation of sins though purification by the four powers, this does not contradict the fact that you are slow to produce higher paths."
-Lam Rim Chen Mo eng v02 pg. 156-157 tib pg. 402
"All memories and thoughts are the union of emptiness and knowing, the Mind.
Without attachment, self-liberating, like a snake in a knot.
Through the qualities of meditating in that way,
Mental obscurations are purified and the dharmakaya is attained."
-Ra Lotsawa, All-pervading Melodious Drumbeats
"You must experience that the various thoughts, in whatever form they arise, are an empty appearance and not a definable entity."
-Clarifying the Natural State pg. 33