Lord Jesus Christ himself

Here "himself" gives additional emphasis to the phrase "Lord Jesus Christ."

may our Lord ... who loved us and gave us

The words "our" and "us" refer to all believers.

"caused us to have eternal comfort and good hope through grace"

"comfort that never ends" or "unceasing encouragement"

"certainty that we will receive good things from him" or "confidence that we will good things from him"

"because of his kindness"