Notice the repetition of the phrase "take responsibility" or "assume responsibility' throughout the chapter. They were taking the commands and regulations that God is giving to heart. To take responsibility means that they will lead in obedience to God. They want God to do what He promises, but are they willing to do what they are taking responsibility for in these declarations?
We have been given God's Word in our own language. it is a great blessing to us to have this. But when we open God's Word we also must take responsibility to line our lives up to what He says. Our human nature wants to blame others for our shortfalls. But when we truly take responsibility we do not cast blame on others, rather we repent and own up to our failures. We also diligently work at the things God calls us to in our lives.