Fortunately for me, as a Catholic, if I have any doubt as to what a passage means, I can rely on the Sacred Tradition to steer me down the right path. The early church fathers, particularly in the second and third centuries, are a wealth of information to turn to on Scripture. And the Catechism of the Catholic Church has a scriptural basis for all tenets of the Faith. I have not read the entire document -- it's huge -- but I have read large chunks at a time and have never been disappointed in its clarity and scriptural support.
God bless.
Gophack, I was raised in the Reformed tradition of John Calvin. I think John Calvin was a sincere and devout Christian. However, I would not consider his writings sacred. I think we need to consider what we call divine and sacred in both an implicit and explicit sense. The creation was established by the Word of God and if we take that into serious contemplation we should be very careful about what we consider divine or sacred, or what is the Word of God. I have no doubt that you can gain additional understanding through the writings of the early Church fathers yet you should not rely on them exclusively.
The grace of the Lord be with you.