The primary purpose of God putting his spirit on individuals was to give them the ability to fulfill the purpose or a specific role that He had chosen them for. The Spirit of God endowed them with the necessary wisdom, insight, knowledge and skill to perform their God appointed role. We can also see that after the Spirit enters them, they learn to walk closely with God. They do not make decisions or take any action without first seeking God's will and direction on the issue.
The take away for me at this point is that the Holy spirit deepens our relationship with God. It transforms us, empowers us in our walk with God. It also makes me realize that on a daily basis, before I make a decision on anything, or take any action, I must pray about it and ask God to let His Spirit direct me. When I have to make major decisions I do that, but I have come to understand that I make decisions on a daily basis and these "small" decisions impact the "major" decisions. So dear Lord, help me remember that I must "commit ALL my ways to You".