Visuddhimagga VIII-219

Athānena nimitteyeva cittaṃ ṭhapetabbaṃ.

（当似相现起之时）彼（比丘）应安住其心于似相。

Ñ(VIII,219): Then he should fix his mind on that same sign;

Evamassāyaṃ ito pabhuti ṭhapanāvasena bhāvanā hoti.

如是自从（似相现起）以后，他便依安住而修习，

Ñ: and so from now on, his development proceeds by way of fixing.

Vuttañhetaṃ porāṇehi –

即如古人说：

Ñ: For the Ancients said this:

‘‘Nimitte ṭhapayaṃ cittaṃ, nānākāraṃ vibhāvayaṃ;

于相安住心，离种种行相，

Ñ: 'Fixing his mind upon the sign

And putting away extraneous aspects,

Dhīro assāsapassāse, sakaṃ cittaṃ nibandhatī’’ti. (pārā. aṭṭha. 2.165);

于出息入息，智者系自心。

Ñ: The clever man anchors his mind

Upon the breathings in and out'.