Bhagavad Gita: Gradually, step by step, one should become situated in trance (Dhyana-yoga (Text 25 Ch 6))

Sri-bhagavan uvaca

sanaih sanair uparamed
buddhya dhrti-grhitaya
atma-samstham manah krtva
na kincid api cintayet

Meaning: Gradually, step by step, one should become situated in trance by means of intelligence sustained by full conviction, and thus the mind should be fixed on the self alone and should think of nothing else.

Bhagavad Gita: Gradually, step by step, one should become situated in trance  (Dhyana-yoga (Text 25 Ch 6))