KAṬHA UPANISHAD · 2.2.1

पुरमेकादशद्वारमजस्यावक्रचेतसः ।
अनुष्ठाय न शोचति विमुक्तश्च विमुच्यते । एतद्वै तत् ॥ १॥

puramekādaśadvāramajasyāvakracetasaḥ ।
anuṣṭhāya na śocati vimuktaśca vimucyate । etadvai tat ॥ 1॥

The Unborn who is not devious-minded hath a city with eleven gates; when He taketh up his abode in it, He grieveth not, but when He is set free from it, that is His deliverance. This is the thing thou seekest.