Ashtangasamgraha 1.3

1.3

āyuḥ kāmayamānena dharmārthasukhasādhanam |

āyurvedopadeśeṣu vidheyaḥ paramādaraḥ ||

tadā hi tau prāptavīryau vīryānvitamapatyaṃ janayataḥ |

ūnapañcaviṃśativarṣeṇonaṣoḍaśavarṣāyāmāhito garbhaḥ kukṣistha eva vināśamāpnuyādalpāyurbalārogyavibhavo vā syādvikalendriyo vā |

ṛtāvādye ca rātritraye tathā duṣṭe śukrārtava iti ||

balādhiṣṭhānamārogyamārogyārthaḥ kriyākramaḥ ||

karṇamūle cāśmanoḥ saṅghaṭṭanam ||

By one who desires long life, the means to achieve virtue, wealth, and pleasure,
supreme respect should be paid to the teachings of Āyurveda.

For then the two, having reached full virility, produce an offspring endowed with virility.

A fetus conceived by a man under twenty-five in a woman under sixteen may perish right in the womb, or have a short life, weak strength, health, and resources, or have impaired senses.

Likewise during the first three nights of the menstrual period, and when semen or menstrual fluid is vitiated.

Health is the foundation of strength; the course of treatment is for the purpose of health.

And the striking together of two stones at the base of the ear.