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Śrīmad-Bhāgavatam
[Canto 10, Ch. 3]
If one is determined to make spiritual advancement, he will not beget a child unless able to make that child a devotee. As stated in  Śrīmad-Bhāgavatam  (5.5.18),  pitā na sa syāt : one should not become a father unless one is able to protect his child from  mṛtyu , the path of birth and death. But where is there education about this? A responsible father never begets children like cats and dogs. Instead of being encouraged to adopt artificial means of birth control, people should be educated in  Kṛṣṇa  consciousness because only then will they understand their responsibility to their children. If one can beget children who will be devotees and be taught to turn aside from the path of birth and death ( mṛtyu-saṁsāra-vartmani ), there is no need of birth control. Rather, one should be encouraged to beget children. Artificial means of birth control have no value. Whether one begets children or does not, a population of men who are like cats and dogs will never make human society happy. It is therefore necessary for people to be educated spiritually so that instead of begetting children like cats and dogs, they will undergo austerities to produce devotees. This will make their lives successful.
TEXTS 34–35
वर्षवातातपहिमधर्मकालगुणाननु । 
  सहमानौ श्वासरोधविनिर्धूतमनोमलौ ॥३४॥ 
  शीर्णपर्णानिलाहारावुपशान्तेन चेतसा । 
  मत्तः कामानमीप्सन्तौ मदाराधनमीहतुः ॥३५॥
varṣa-vātātapa-hima- 
  gharma-kāla-guṇān anu 
  sahamānau śvāsa-rodha- 
  vinirdhūta-mano-malau
śīrṇa-parṇānilāhārāv 
  upaśāntena cetasā 
  mattaḥ kāmān abhīpsantau 
  mad-ārādhanam īhatuḥ
varṣa—the rain; vāta—strong wind; ātapa—strong sunshine; hima—severe cold; gharma—heat; kāla-guṇān anu—according to seasonal