Bhashya
यत इन्द्राद्यात्मान स्वरादय , अत सर्वे स्वरा घोषवन्तबलवन्तो वक्तव्या ।तथा अहमिन्द्रे बल ददानि बलमाद-धानीति ।तथा सर्वे ऊष्माण अग्रस्ता अन्तरप्रवेशिताअनिरस्ता बाहरप्रक्षिप्ता विवृता विवृतप्रयत्नोपेता ।प्रजा-पतेरात्मान परिददानि प्रयच्छानीति ।सर्वे स्पर्शा लेशेनशनकै अनभिनिहिता अनभिनिक्षिप्ता वक्तव्या ।मृत्योरात्मान बालानिव शनकै परिहरन् मृत्योरात्मान परिहराणीति ॥
In plain words
Since the vowels and other sounds have deities like Indra as their very essence, all vowels must be uttered with resonance and strength, with the thought: 'May I bestow strength, may I infuse strength into Indra.' Likewise, all sibilants must be uttered unswallowed—not drawn too far inward—and unrejected—not flung too far outward—and open, possessing the open vocal effort, thinking: 'May I entrust, may I surrender my self to Prajāpati.' And all stop consonants must be uttered very gently and without heavy pressure, thinking: 'Just as one carefully protects children, gently shielding my self from Death, may I protect my self.'
Close to the Sanskrit
Since Indra and others are selves the vowels and others, therefore all vowels sonorous strong to be spoken. Thus 'May I give strength in Indra, may I place strength'. And all sibilants unswallowed—brought inside, unrejected—flung outside, open—endowed with open effort. 'Prajāpati's self may I entrust, may I hand over'. All stops with a trace—gently, uncompressed—unplaced, to be spoken. 'Death's self—like children gently protecting—may I protect Death's self' thus.