user2495: What is the exact meaning of 'acala sukha'? Is it mentioned in the Pali-canon? If so, where ? In what context ?

user254: The PTS dictionary says,

Cala (adj.) [see calati] moving, quivering; unsteady, fickle, transient S iv.68 (dhammā calā c' eva vyayā ca aniccā, etc.); J ii.299; iii.381; v.345; Miln 93, 418; Sdhp 430, 494.
  -- acala steadfast, immovable S i.232; J i.71 (ṭṭhāna); Vv 514 (˚ṭṭhāna=Ep. of Nibbāna); acalaŋ sukhaŋ (=Nibbāna) Th 2, 350; cp. niccala motionless DhA iii.38

So cala means "unsteady", acala means "not unsteady", and acala sukha means "unwavering happiness" i.e. nibbana.
The phrase is in some of the suttas, e.g. the last line of Ud 8.10; and the end of the first verse of Thag 3.16.

2495: <p>What is the exact meaning of '<em>acala sukha'</em>? Is it mentioned in the Pali-canon? If so, where ? In what context ?</p>
 254: <p>The <a href="http://dsalsrv02.uchicago.edu/cgi-bin/philologic/getobject.pl?c.1:1:1424.pali" rel="nofollow noreferrer">PTS dictionary</a> says,</p>

<blockquote>
  <p><strong>Cala</strong> (adj.) [see calati] moving, quivering; unsteady, fickle, transient S iv.68 (dhammā calā c' eva vyayā ca aniccā, etc.); J ii.299; iii.381; v.345; Miln 93, 418; Sdhp 430, 494.<br>
  -- <strong>acala</strong> steadfast, immovable S i.232; J i.71 (ṭṭhāna); Vv 514 (˚ṭṭhāna=Ep. of Nibbāna); acalaŋ sukhaŋ (=Nibbāna) Th 2, 350; cp. niccala motionless DhA iii.38</p>
</blockquote>

<p>So <em>cala</em> means "unsteady", <em>acala</em> means "not unsteady", and <em>acala sukha</em> means "unwavering happiness" i.e. nibbana.</p>

<p>The phrase is in some of the suttas, e.g. the last line of <a href="https://accesstoinsight.org/tipitaka/kn/ud/ud.8.10.than.html" rel="nofollow noreferrer">Ud 8.10</a>; and the end of the first verse of <a href="https://suttacentral.net/en/thag3.16" rel="nofollow noreferrer">Thag 3.16</a>.</p>
