Enthusiasm carries us a long way but it's not enough on its own to complete a complex task.
We might be inspired and have all the right skills but unless our hearts are really set on achieving the goal, even the efforts of the great and the good to encourage us and urge us on will come to very little. We may hear the word of God (as the nation of Israel did in Haggai's time) but hearing won't sustain us through difficulty unless we are prepared to take on board everything God says.
We often need just that little bit extra to spur us on.. It might be a simple reminder of what things were like and could be again - it could even be personal assurance that we are in the right place to achieve the right things for God. Whatever we need, God is always ready to supply it. But, be careful: it will change your life and outlook.