One verse

Srimad Bhagavatam 11.15.32

11.15.32

जितेन्द्रियस्य दान्तस्य जितश्वासात्मनो मुने: । मद्धारणां धारयत: का सा सिद्धि: सुदुर्लभा ॥ ३२ ॥

jitendriyasya dāntasya jita-śvāsātmano muneḥ mad-dhāraṇāṁ dhārayataḥ kā sā siddhiḥ su-durlabhā

jita-indriyasya
of one who has conquered his senses
dāntasya
who is disciplined and self-controlled
jita-śvāsa
who has conquered his breathing
ātmanaḥ
and conquered the mind
muneḥ
of such a sage
mat
in Me
dhāraṇām
meditation
dhārayataḥ
who is conducting
kā
what is
sā
that
siddhiḥ
perfection
su-durlabhā
which is very difficult to achieve

For a sage who has conquered his senses, breathing and mind, who is self-controlled and always absorbed in meditation on Me, what mystic perfection could possibly be difficult to achieve?