The lines - The word used here refers to the “lines” employed in measuring and dividing land, Amos 7:17; 2 Samuel 8:2. Hence, the word comes to denote a portion of land that is “measured out” (or that is “surveyed off”) to anyone - his possession or property; and hence, the word refers to the condition in life. The meaning here is, that in running out such a survey, “his” inheritance had been fixed in a pleasant and desirable part of the land.
Are fallen unto me - Referring to the appropriation of the different parts of the land by lot. The idea is, that the land was surveyed into distinct portions, and then that the part which fell to anyone was determined by lot. This was actually the case in distributing the land of Canaan, Numbers 26:55; Numbers 33:54; Numbers 36:2; Josh. 15–19.
In pleasant places - In a pleasant or desirable part of the land.
Yea, I have a goodly heritage - A good, a desirable inheritance. The meaning is, that he regarded it as a desirable heritage that he lived where the true God was known; where he enjoyed his favor and friendship.