This passage is used as evidence for the theological view known as the rapture, which prevalent in America, especially amongst pre-millenialists.
The simple explanation (which you can read about in fictionalised form in the popular Left Behind books), is that true Christians will be spared the tribulations of the End Times, by being taken away to the New ...
As @curiousdanni pointed out in comments, the text here does not put forth the eternality of the Law and Prophets but rather highlights two conditions in which they may or will pass away: If the current created order passes away or if everything in them is fulfilled. It is possible that these two are to be understood as concurrent but that is not necessary....
In addition to the answer above, below is a bible commentary:
Till they see the Son of man coming in his kingdom. Some expound this,
as fulfilled at his transfiguration, which follows in the next
chapter. Others understand it of the glory of Christ, and of his
Church, after his resurrection and ascension, when he should be owned
for Redeemer of ...
He was speaking literally in a way: "six days later", at the transfiguration, they did see some of the glory that Jesus would have at that time, and seeing Peter's reaction it was quite impressive. Read on in chapter 17:1-9, that's where your answer is.
In verses 10-13, Jesus explains a bit more about the time they lived in at that point.
From Mat. 2:1,2,7 we can gather that they were astrologers (or "magi"), looking for omens in/among the stars. Just as astrology does nowadays, producing the horoscopes that many (have) put their faith in.
One of the foremost references to such people in the Hebrew Scriptures can be found in Daniel 2:27, that relates the failure of the wise men, conjurers, ...
Is there one guardian angel for each person?
According to the Catholic Church, Tradition, St. Thomas Aquinas and other theologians, the answer is yes.
St. Thomas states the following in his Summa Theologiae the following:
Whether men are guarded by the angels?
According to the plan of Divine Providence, we find that in all things the movable and ...