Baptism is the door to the church – The Largely Catechized Life #70

But, in the first place, we take up Baptism, by which we are first received into the Christian Church. However, in order that it may be readily understood, we will treat of it in an orderly manner, and keep only to that which it is necessary for us to know. For how it is to be maintained and defended against heretics and sects we will commend to the learned.