ते य एवमेतद्विदुर्ये चामी अरण्ये श्रद्धा ँ सत्यमुपासते तेऽर्चिरभिसंभवन्त्यर्चिषोऽहरह आपूर्यमाणपक्षमापूर्यमाणपक्षाद्यान्षण्मासानुदङ्ङादित्य एति मासेभ्यो देवलोकं देवलोकादादित्यमादित्याद्वैद्युतं तान्वैद्युतान्पुरुषो मानस एत्य ब्रह्मलोकान्गमयति ते तेषु ब्रह्मलोकेषु पराः परावतो वसन्ति तेषां न पुनरावृत्तिः ॥ १५ ॥
In plain words
Those who understand this, and those forest-dwellers who worship faith itself as truth -- they rise to the flame; from the flame, to the day; from the day, to the fortnight of the waxing moon; from there, to the six months when the sun climbs north; from those months, to the world of the gods; from the world of the gods, to the sun itself; from the sun, into the region of lightning. There, a being made purely of mind meets them and leads them onward into the worlds of brahman. In those worlds they dwell for the vastest stretches of time there are. For them, there is no coming back.
Close to the Sanskrit
Those who know this thus, and those who, in the forest, worship faith as truth -- they go to the flame; from the flame, to the day; from the day, to the waxing fortnight; from the waxing fortnight, to those six months during which the sun moves northward; from the months, to the world of the gods; from the world of the gods, to the sun; from the sun, to the region of lightning. A person made of mind, having approached those who have reached the lightning region, leads them on to the worlds of brahman. They, in those worlds of brahman, dwell for supreme extents of time. For them there is no return.