gadher abhun maha-tejah
samiddha iva pavakah
tapasa ksatram utsrjya
yo lebhe brahma-varcasam
gadheh—from Maharaja Gadhi; abhut—was born; maha-tejah—very powerful; samiddhah—inflamed; iva—like; pavakah—fire; tapasa—by austerities and penances; ksatram—the position of a ksatriya; utsrjya—giving up; yah—one who (Visvamitra); lebhe—achieved; brahma-varcasam—the quality of a brahmana.
Visvamitra, the son of Maharaja Gadhi, was as powerful as the flames of fire. From the position of a ksatriya, he achieved the position of a powerful brahmana by undergoing penances and austerities.
Now, having narrated the history of Lord Parasurama, Sukadeva Gosvami begins the history of Visvamitra. From the history of Parasurama we can understand that although Parasurama belonged to the brahminical group, he circumstantially had to work as a ksatriya. Later, after finishing his work as a ksatriya, he again became a brahmana and returned to Mahendra-parvata. Similarly, we can see that although Visvamitra was born in a ksatriya family, by austerities and penances he achieved the position of a brahmana. These histories confirm the statements in sastra that a brahmana may become a ksatriya, a ksatriya may become a brahmana or vaisya, and a vaisya may become a brahmana, by achieving the required qualities. One’s status does not depend upon birth. As confirmed in Srimad-Bhagavatam (7.11.35) by Narada:
yasya yal laksanam proktam
pumso varnabhivyanjakam
yad anyatrapi drsyeta
tat tenaiva vinirdiset
“If one shows the symptoms of being a brahmana, ksatriya, vaisya or sudra, even if he has appeared in a different class, he should be accepted according to those symptoms of classification.” To know who is a brahmana and who is a ksatriya, one must consider a man’s quality and work. If all the unqualified sudras become so-called brahmanas and ksatriyas, social order will be impossible to maintain. Thus there will be discrepancies, human society will turn into a society of animals, and the situation all over the world will be hellish.

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