I sat watching Mina's happy sleep, and I came as near to being happy myself as I suppose I shall ever be.

As the evening drew on, and the earth took its shadows from the sun sinking lower, the silence of the room grew more and more solemn to me.
All at once Mina opened her eyes, and looking at me tenderly said, "Jonathan, I want you to promise me something on your word of honour.
A promise made to me, but made holily in God's hearing, and not to be broken though I should go down on my knees and implore you with bitter tears.

Quick, you must make it to me at once." "Mina," I said, "a promise like that, I cannot make at once.

I may have no right to make it." "But, dear one," she said, with such spiritual intensity that her eyes were like pole stars, "it is I who wish it.

And it is not for myself.
You can ask Dr.Van Helsing if I am not right.