A 12th century Tibetan (Kadampa school) thangka depicting the Buddhist deity Achala stepping on Vighnarāja, the "Lord of Obstacles"

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A 12th century Tibetan (Kadampa school) thangka depicting the Buddhist deity Achala stepping on Vighnarāja, the "Lord of Obstacles"
What is called Fudō Myōō is said to be one’s unmoving mind and an unvacillating body. Unvacillating means not being detained by anything.
— Takuan Sōhō, The Unfettered Mind: Writings from a Zen Master to a Master Swordsman, transl by William Scott Wilson, (2012)
Achala, nepali sculpture
Arunachala, by Bernd Kalidas Flory
ॐ
On considering the import of the name Arunachala, which bestows Liberation (Mukti) when merely thought of and which is lustrous like red gold, it is revealed that the meaning of the three syllables ‘A-ru-na’ is not only Existence - Consciousness - Bliss (Satya - Chit - Sukha) but also that great vedic revelation ‘That Thou Art’ (Tat-Tvam-Asi), which denotes the oneness of the Supreme and the Soul (Parajiva Aikya), and that the meaning of Achala is ghana (firmness, fullness, abundance or greatness).
ॐ
Bhagavan Sri Ramana Maharshi - Poems & Himns Arunachala Navamanimalai - The Necklet of Nine Gems - G. 2, pg. 104
Note : When a Guru formally gives a mantra to His disciple, He explains to him the meaning and significance of each syllable of the mantra and tells him the fruit to be gained by meditating upon that mantra. In the same manner, in this verse, Sri Bhagavan has explained the meaning of each syllable in the name ‘Arunachala’ and has revealed that mere thought of this name, will bestow liberation. Therefore the name Arunachala is the mantra which Sri Bhagavan has openly given to the whole world, so if any of His devotees wish to have a mantra they can confidently regard this name to be the mantra given to them by Him.
Chandamaharoshana (Achala) Gyantse Kumbum, Tibet
Naritasan Achala Temple Japan
Achala, Nepal or Tibet
Moss covered Achala (Fudo Myo) shrine, Osaka, Japan