okey so in my opinon:
1- it talks more or less about a prophessy in wich a even greatest "master" needs to be defeated, but it will no be in that day, wich mean not in HL2
2- seems like gordon as a darker side fo himself, wich we no nothing about
3- the vorginaut shares the same ogjective as gordon, wich is weird since gordon doesn't know wath is objective is.
4- gordon carries the hopes of all humans
5- litel word game with is name, in wich every1 should be a free man
6- this encreases the importance of gordon, is described almost as a god
7- can't explain a bit confusing
8- they know nothing about him, this also doesn't make any sense, since the vorginaut seems to knwo more about gordon, then gordon himself
9- gordon mission will affect many places, maybe talking about other demisions
10- that secret maybe the key for the HL story
11- black mesa was not very important to the story
12- another thing that doesn't fit in the other sentences, since the vorginaut, has a great knoledge of gordon. but maybe is trying to say that he should share is feelings more with other people
13- my english isn't good enough for this one ^^
14- also confusing, may be saying that him and gordon are the same person in diferent dimensions
15- once again the mystery or secret, maybe is talking about g-man, since gordon serves g-man, so this character may also serve him
16- they have the same objective
17- same as n. 14
18- don't understand either
19- another non sense, since he didn't wated to talk about balck mesa, but may be pointing that black mesa was a test to gordon and that they where observing him
20- gordon never gave up, that's wath i take from this
21- gordon is a important key between the "worlds"
22- the vortessence are turning in to one, but i doesn't says wath is the vortessence.
23- he says that is people canot forgive gordon, or gordon enemies, don't understand wich ones is talking about.
24- okey this one brings me back to n22, it seems like there are several worlds, wich are turning into just one, maybe there's a group trying to conquer all the worlds, wich can be the combine leaders
25- gordon made them happy, that's nice
26- gordon is still being tested i believe
27- the ending is coming? but it will be a dark ending
28- the corrent way to solve the problem, is not the best one, maybe is refering to the fact that gordon is working for the g-man, and g-man is a evil person
29- this creatures have non feelings
30- I think he is saying that they remeber the past
okey so this is my interpretation of this sentences, keeping in mind that i didn't played HL2 yet. they give some clues on wath the future(AKA HL3 probably) will bring. if any1 want's to especualte a bit more, feel free to do it ^^ if blink allows it that is