Hebrews 3:10

I was grieved with that generation. — Rather, I was angry with this generation. The Hebrew is very strong: “I loathed a (whole) generation.” The first word, “Wherefore,” is not found in the Psalm, but is added to make the connection more distinct.

And they have not known my ways. — Better, yet they took not knowledge of My ways. Although throughout the forty years He had shown to them their disobedience and His displeasure, yet the warning and discipline were fruitless. They gained no knowledge of His ways. It is very important to observe this explicit reference to the close, as well as the beginning of the forty years. (See Hebrews 3:8.)