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Since it is rarely quoted correctly, I reproduce the relevant text from Humanae Vitae, the 1968 encyclical letter of Pope Paul VI. Latinists need not skip to the translation.
Si igitur iustae adsint causae generationes subsequentes intervallandi, quae a coniugum corporis vel animi condicionibus, aut ab externis rerum adiunctis proficiscantur, Ecclesia docet, tunc licere coniugibus sequi vices naturales, generandi facultatibus immanentes, in maritali commercio habendo iis dumtaxat temporibus, quae conceptione vacent, atque adeo nasciturae proli ita consulere, ut morum doctrina, quam modo exposuimus, haudquaquam laedatur.(20)
If therefore there are well-grounded reasons for spacing births, arising from the physical or psychological condition of husband or wife, or from external circumstances, the Church teaches that married people may then take advantage of the natural cycles immanent in the reproductive system and engage in marital intercourse only during those times that are infertile, thus controlling birth in a way which does not in the least offend the moral principles which We have just explained. (20)