These may be the verses:

arjuna — Arjuna; uvāca — said; evaṁ — thus; satatayuktā = satata—constantly + yuktā — disciplined in yoga; ye — who; bhaktāh — devoted; tvam —you; paryupāsate — they cherish; ye — who; cāpi = ca — and + api — also; akṣaram — imperishable; avyaktaṁ — invisible existence; teṣāṁ — of them; ke — which; yogavittamāḥ — those who have the highest knowledge of yoga

Arjuna said: Of those who are constantly disciplined in yoga, being also devoted to You, and those who cherish the imperishable invisible existence, which of these two have the highest knowledge of the yoga techniques? (Bhagavad Gita 12.1)

Śrībhagavān — the Blessed Lord;uvāca — said; mayyāveśya = mayi-on me + āveśya — focusing on: mano = manaḥ — mind; ye — who; māṁ — me; nityayuktā — those who are always disciplined in yoga; upāsate — they worship; śraddhayā — with faith; parayopetās = parayā — with the highest degree; + upetāḥ — endowed; te they; me — to me; yuktatamā — most disciplined; matāḥ — considered

The Blessed Lord said: Those whose minds are focused on Me, who are always disciplined in yoga, who are always involved in worship of Me, who are endowed with the highest degree of faith, they are considered to be the most disciplined. (Bhagavad Gita 12.2)

ye — who; tu — but; akṣaram — imperishable; anirdeśyam — undefinable; avyaktaṁ— invisible; paryupāsate — they cherish; sarvatragam — all-pervading; acintyam — inconceivable; ca — and; kūṭastham — unchanging; acalaṁ —- immovable; dhruvam — constant

But those who cherish the imperishable, undefinable, invisible, all-pervading, inconceivable, unchanging, immovable, constant reality, (Bhagavad Gita 12.3)

saṁniyamyendriyagrāmaṁ = saṁniyamya — controlling + indriyagrāmaṁ — all sensual energies; sarvatra — in all respects; samabuddhayaḥ — even-minded; te — them; prāpnuvanti — they attain; mām — me; eva — also; sarvabhūtahite = sarvabhūta — all creatures + hite — in the welfare; ratāḥ — rejoicing

...by controlling all sensual energies, being even-minded in all respects, rejoicing in the welfare of all creatures, they also attain Me. (12.4)

kleśo — kleśaḥ — exertion; 'dhikataraḥ = adhikataraḥ — greater; tesam — of them; avyaktāsaktacetasām — avyakta — invisible existence + āsakta — attached + cetasām — of minds; avyaktā — invisible reality; hi — truly; gatiḥ — goal; duḥkhaṁ — difficult; dehavadbhiḥ — by the human beings; avāpyate — is attained

The mental exertion of those whose minds are attached to the invisible existence is greater. The goal of reaching that invisible reality is attained with difficulty by the human beings. (Bhagavad Gita 12.5)