Valmiki Ramayana Bala Kanda Sarga 22 Shloka 19

एते बहुगुणा: these many qualities, सर्वे all, कामम् very-well, त्वयि in you, अत्र in this matter, संशय: न no doubt, तपसा with asceticism, सम्भृते nourished, एते these two sciences, बहुरूपे multiple forms, भविष्यत: will assume.

You possess all these qualities in great measure. There is no doubt that If these two sciences (mantras) are nourished with austerities they will assume multiple forms (and benefit you)".