Believing is a path. One learns how to stay on this path, in other words, how to act rightly and to lead a good life, only by following the instructions in the Gospel. The teaching authority ( Magisterium) of the Church must remind people also about the demands of the natural moral law.
There are not two truths. What is humanly right cannot be wrong from the Christian perspective. And what is right according to Christianity cannot be humanly wrong. That is why the Church must teach comprehensively about moral issues.
Posted from My Samsung Galaxy Note WordPress for Android