Puggalapannatti 2.1.4.2

2.1.4.2

Idhekacco puggalo lābhī hoti rūpasahagatānaṃ vā arūpasahagatānaṃ vā samāpattīnaṃ.

Here a person obtains the attainment (of ecstatic trance) whether accompanied by an idea of form or by an idea of formlessness, and he surely obtains them as he desires, without difficulty or toil, and he gets into and gets up from them where he desires, when he desires, and as long as he desires; there is no occasion and there is no opening that indolence coming over him should perturb the attainments of that person. Such a person is said to be of imperturbable nature. Indeed, all persons who are Ariyas (noble or elect) are of imperturbable nature in matters of Ariyan emancipation.