Rasadhyaya 12

12

brahmacaryaṃ tapaḥ kāryaṃ haviṣyānnasya bhojanam
kriyābhraṣṭe na sidhyanti taponaṣṭe phalanti na //

Chaste asceticism and austerity should be performed, [and] the eating of sacrificial food; / for one fallen from the practice, they do not succeed; for one deprived of austerity, they bear no fruit.