ऊर्ध्वं गच्छन्ति सत्त्वस्था मध्ये तिष्ठन्ति राजसाः।जघन्यगुणवृत्तिस्था अधो गच्छन्ति तामसाः
ūrdhvaṁ gachchhanti sattva-sthā madhye tiṣhṭhanti rājasāḥ jaghanya-guṇa-vṛitti-sthā adho gachchhanti tāmasāḥ
When purity is in the ascendant, the man evolves; when passion is in the ascendant, he neither evolves nor degenerates; when ignorance is in the ascendant, he is lost.
Translated by Shri Purohit Swami
Those seated in Sattva ascend; those of Rajasic nature dwell in the middle; and those of Tamasic nature, abiding in the function of the lowest Guna, descend.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
ūrdhvam—upward; gachchhanti—rise; sattva-sthāḥ—those situated in the mode of goodness; madhye—in the middle; tiṣhṭhanti—stay; rājasāḥ—those in the mode of passion; jaghanya—abominable; guṇa—quality; vṛitti-sthāḥ—engaged in activities; adhaḥ—down; gachchhanti—go; tāmasāḥ—those in the mode of ignorance