"Baruch Hashem!" Hashem is, was, and always will be. He is the master of all. However, Hashem left one entity untethered in His creation that doesn't inherently acknowledge His greatness & ownership of all. This entity is man! We must actively work toward acknowledging and realizing Hashem in this world and help others achieve the same.
Abraham preps his servant Eliezer in finding a suitable spouse for Isaac. Eliezer is concerned about finding success with Abraham's assignment. Abraham assures Eliezer that Hashem will make successful his journey because of the unique relationship between Abraham and Hashem.
Abraham describes to Eliezer that the uniqueness of his relationship with Hashem is such because of what Abraham had done. Abraham had brought Hashem's presence in creation from being only "God of the heavens" in perception to now being "God of the heavens and the earth." (Gen. 24:3) Man now recognized Hashem and commonly mentioned Hashem's name in this world due to Abraham. "Baruch Hashem!"
"Hashem, God of the heavens, Who took me (Abraham) from the house of my father and from the land of my birth . . ." Genisis 24:7 (see Rashi there). From this week's Torah portion, Chayei Sarah, Genesis 23:1-25:18