Goddesses, other than Ushas, mentioned in early Vedic literature include "Prthivi" (earth), "Aditi" (mother of gods, abundance), "Sarasvati" (river, nourishment), "Vac" (sound and speech), and "Nirrti" (death, destruction). Similarly male gods feature prominently in the Vedas, with "Indra" (rain, lightning), "Agni" (fire), "Varuna" (rta, law), "Dyaus" (sky, virility), "Savitr" ("Surya", sun), and "Soma" (drink) some of the most mentioned. The two deities most mentioned in Rigveda are Indra and Agni, both male. Surya is the third most revered god, again a male. Each is mentioned, anywhere rain and fire is evoked. They are profusely praised, with ceremonies and prayers to all gods and goddesses symbolically organized around fire (Agni yajna). The hymns seek strengthening of fire, and it is god Indra who increases the energy of the fire, while god Surya increases his brightness. Max Muller states that, while there are difference in frequency of mentions, gods and goddesses in Rig veda are "neither superior nor inferior; almost every one is represented as supreme and absolute".