I found a screenshot of the letter that Jorah wrote to Khaleesi in Episode 2 assuming it's going to be his last night:

Although the handwriting is quite clear, here's what he says:

Khaleesi, I came to the Citadel in the last hope that the maesters could treat me, as you ordered. Even with all their arts, I am beyond any cure but the grave. I have had a longer life than I deserved, and I only wish I could’ve lived to see the world you’re going to build, standing by your side. I have loved you since the moment I met you. 

Hopefully Sam will be able to treat Jorah, so that he can see Khaleesi one day.