Yea we know he was speaking Slovican, but we don't know why he was saying some of it.. He was just speaking nonsense for the most part at first... The doctors said that when someone is in an accident or what have you what they try to fill in the blanks and what not with whatever they see or can think of.. Usually doesn't make sense because it is whatever is going on in their head while they are out of it and don't really know what is going on..

__________________
Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.