Bhagavad Gita 2.66

2.66 There is no knowledge of the Self to the unsteady and to the unsteady no meditation is possible, and to the unmeditative there can be no peace, and to the man who has no peace, how can there be happiness?

One who is not connected with the Supreme [in Kṛṣṇa consciousness] can have neither transcendental intelligence nor a steady mind, without which there is no possibility of peace. And how can there be any happiness without peace?