"By the early 1950s, however, options for artificial contraception were growing, including the pill. Devout Catholics wanted explicit permission to use them. Church leaders confronted the issue head-on, expressing a variety of viewpoints. In light of these new contraceptive technologies and developing scientific knowledge about when and how conception occurs, some leaders believed the church could not know God’s will on this issue and should stop pretending that it did, as Dutch Bishop William Bekkers said outright on national television in 1963. Even Paul VI admitted his confusion. In an interview with an Italian journalist in 1965, he stated, “The world asks what we think and we find ourselves trying to give an answer. But what answer? We can’t keep silent. And yet to speak is a real problem. But what? The Church has never in her history confronted such a problem.”"
January 1, 1970
https://en.wikiquote.org/wiki/Christian_views_on_birth_control