Mantra 12

नैव वाचा न मनसा प्राप्तुं शक्यो न चक्षुषा ।अस्तीति ब्रुवतोऽन्यत्र कथं तदुपलभ्यते ॥ १२ ॥

In plain words

It cannot be attained by speech, nor by the mind, nor by the eye. Apart from one who says 'It is,' how else is it to be apprehended?