The Relief of Relinquishing all Resentment!

When one's resentment towards any hostile person has been allayed, then
one can deliberately turn mind with loving-kindness towards any person:
Both the very dear friend, the neutral person and the hostile opponent!
By repeated praxis of meditation on infinite friendliness one gradually
breaks down the mental barrier of evil opposition thereby accomplishing
mental impartiality towards the 4 persons: oneself, the very dear person,
the neutral person and the hostile person. Suppose a trainee is sitting in
a place with a dear, a neutral, and a hostile person, himself being the 4th.
Then bandits come to him and say, 'Venerable friend, give us a person so
that we may kill him and use the blood of his throat as an offering'...!
When one does not see a single one among these four people suitable to
be given to the bandits and one directs mind impartially towards oneself
and towards those three people, then one has broken down the barriers...


Breaking the Barrier to:          Impartiality

Therefore the Ancient Nobles said:
When he does not discriminates between the 4 persons:
That is: Himself, the dear, the neutral, and the hostile one,
Then "Skilled" is not the name he gets, nor "Most Friendly",
But only "Kind towards all beings". Now when a bhikkhu's
barriers towards all the 4 persons have been broken down,
The he treats with equal amity all beings in the whole world;
Exalted and distinguished is he, who knows no barriers...
Vism 307

Universal friendliness, which cures all resentment, is a divine state:
Metta, Buddha on Noble Friendship, Good_Friendship, Blazing Friendliness,
Selfless Friendship is Sweetest, All Embracing Kindness, United_in_Harmony,
United in Harmony, Goodwill Encore, The Good Friend, Blazing & Bright,
Kalyanamitta, Friendliness Frees, Blazing_Friendliness, Brahma vihaara,
Infinite_Friendliness, Unique_Unity Good-Will_Again, Bon_Benevolence,
Good_Friendship, The_Good_Friend, Goodwill_Encore, Released_by_GoodWill,
All_Embracing_Kindness, What_is_Wrong, Infinite_and_Divine_Classic,
Universal_Friendliness, The-Effective_Saw, All-Embracing_Kindness,
Friendly_plus_Unselfish_equals_Honourable, The_Grace_of_Goodwill,
Unsurpassable_Radiance, Safe_Medicine, Symbiotic_Sympathy,
Calm_Kindness, Blazing_Goodwill, Genuine_Goodwill!

Entangled by the bonds of hate, one who seeks one's own happiness,
by inflicting pain on others, is never delivered from hatred.
Dhammapada 291

Breaking down the Barriers!