The Christian movement began after the resurrected Jesus had spent the better part of six weeks with his numskull disciples. That was when he showed them too many amazing things to list in the pages of books (John 21:25). The result of that intense training program, with the Spirit of Jesus Christ their teacher, after Jesus ascended into Heaven on the 49th day (after taken into captivity in Gethsemane), those disciples were filled with the Holy Spirit and began performing their own amazing feats. They became the new priests of the Church that would serve Christ; and they were priests who sought people willing to believe and become new priests with the same powers those disciples found, from Jesus, through the Holy Spirit.
The corruption of the Church has been the slow evolution that led away from having each Church member be a priest for Jesus Christ and God, to a number of churches that are just like the prison the Jerusalem temple had become. When we let the (fill in the blank) Church (in my case, Episcopal or Anglican) train priests in a school, hire them (wet behind the ears) to guide you from knowledge (not wisdom), instead of having all of the Church body equally able to preach from the Holy Spirit, we are lost. When you let that Church instruct its hired hands to preach to you, prepared sermons that too frequently say, It is okay for you to slumber in pews, as long as you remember, The Lord loves a cheerful giver, you have lost all serious touch with the Lord.
You no longer have anything other than the occasional inkling of thoughts, where your self tells you to do good and help others; but with no true inspiration to actually get up and do something for good, to actually help another human being, you think you are good for thinking of doing good. Calling yourself a Christian makes it all seem like you are on your way to Heaven; but you lack connecting to God or Christ through the Holy Spirit. Inspiration is the light that tells you the path you are on is the correct one. Nostradamus repeated that the Holy Spirit was his inspiration for writing The Prophecies.
Now, do not get me wrong. A corrupted Church does not necessarily mean an evil Church, although there have been many reports in the past 50 years about evil things done by people who make their living working in churches. The Church is still an element for connecting to Jesus Christ and God; and there are still people under the Church's employ who serve the Lord and care about leading you as a good shepherd would. The point that has to be understood is this: No one is going to be there to walk your soul to Heaven for you, when you die. You have to walk that path yourself; and that means you need to be able to hear Jesus telling you which way Heaven is, through being in contact with the Holy Spirit. Heaven is a most holy place, where only true priests are allowed.
Now, with that understood, let us take a look at what the Roman Catholic Church has determined to be the true way God chooses (and thus Jesus too) prophets. They have guidelines to follow; and even though many people can clearly see the corruption of the Church of Rome, you do not throw the baby out with the bath water. They were the ones who sponsored the councils that gave us the Nicene and Constantinople Creeds. This means that in the long history of the Roman Catholic Church there have actually been some truly holy men, connected to Jesus through the Holy Spirit, who came to understand how to recognize holy when holy appears.
According to Catholic Encyclopedia, under the word "prophecy," and under the subheading "Recipient of Prophecy," they bullet point list some qualifying traits that true prophets have in common. I think it is important to know what they believe on this matter, since I say Nostradamus was a true prophet of Jesus Christ. These traits are:
The recipient of the gift of prophecy should, as a rule, be good and virtuous, for all mystical writers agree that for the most part this gift is granted by God to holy persons.
The prophecy must be conformable to Christian truth and piety, because if it propose anything against faith or morals it cannot proceed from the Spirit of Truth.
The prediction should concern things outside the reach of all natural knowledge, and have for its object future contingent things or those things which God alone knows.
It should also concern something of a grave and important nature, that is something for the good of the Church or the good of souls.
Prophecies or revelations which make known the sins of others, or which announce the predestination or reprobation of souls are to be suspected.
We have afterwards to ascertain whether the prophecy has been fulfilled in the way foretold.
There are some limitations to this:
if the prophecy was not absolute, but containing threats only, and tempered by conditions expressed or understood, as exemplified in the prophecy of Jonas to the Ninivites, and that of Isaias to King Ezechias;
it may sometimes happen that the prophecy is true and from God, and the human interpretation of it is false, as men may interpret it otherwise than God intended.
Well, I think that sums everything up nicely. Nostradamus was a prophet of Jesus Christ, unless you can bring forth adequate evidence (solid proof) that he was an evil person, who wrote contrary to Christian morals, who predicted unnatural events to occur, who wrote nonsense that does nothing to help mankind, and who stated everything is predestined and cannot be avoided. After you submit that proof, we will sit in rocking chairs on the front porch and see if any of it comes true.
Once you see how to understand the Letter of Preface (and later the Letter to Henry II) you will have all questions answered, as far as the qualifications listed above. You will be able to see Nostradamus explaining a warning of times to come, when morals will be forgotten to have come from God. It will be a time when the Church has become corrupted. It will be a time that will be fully understood as now; but it will be a future that can be avoided. The way to avoid it is through complete faith that only Jesus could have seen the future, especially the parts since past, so infallibly that no man could have ever produced Les Propheties without divine intervention, through the Holy Spirit.
Defining A "Prophet", Relative to "The Church"
All Material Copyright of Robert Tippett with the exception of the obviously stolen stuff