One verse

Bhagavad Gita 6.36

6.36

असंयतात्मना योगो दुष्प्राप इति मे मतिः | वश्यात्मना तु यतता शक्योऽवाप्तुमुपायतः ||६-३६||

asaṃyatātmanā yogo duṣprāpa iti me matiḥ . vaśyātmanā tu yatatā śakyo.avāptumupāyataḥ ||6-36||

asaṁyata
unbridled
ātmanā
by the mind
yogaḥ
self-realization
duṣprāpaḥ
difficult to obtain
iti
thus
me
My
matiḥ
opinion
vaśya
controlled
ātmanā
by the mind
tu
but
yatatā
while endeavoring
śakyaḥ
practical
avāptum
to achieve
upāyataḥ
by appropriate means

For one whose mind is unbridled, self-realization is difficult work. But he whose mind is controlled and who strives by appropriate means is assured of success. That is My opinion.