BG 2.66
न चाभावयतः शान्तिरशान्तस्य कुतः सुखम् ॥
na cābhāvayataḥ śāntir aśāntasya kutaḥ sukham
Word-for-word meanings
ayuktasya — for one who has no control over the mind and senses; na asti — there cannot be; buddhiḥ — discernment; ca — and; ayuktasya — for one who has no control over the mind and senses; na [asti] — there cannot be; bhāvanā — God-consciousness; abhāvayataḥ — [moreover] for one who is not God-conscious; na [asti] — there cannot be; śāntiḥ — peace; ca — and; kutaḥ — how; sukham — [can there be] happiness; aśāntasya — for one who is not peaceful.
Translation
A person whose mind and senses are uncontrolled cannot develop proper discernment nor can he be God-conscious*. Moreover, one who is not God-conscious cannot attain peace, and without peace of mind, how can a person attain true happiness?
Notes
* The term bhāvanā means awareness or concentration of the mind. Here it is taken to mean God-consciousness.