First, draw a line down the center of a sheet of paper.
On one side, make a list of the things you are doing to achieve a certain goal. Make sure to note only the actions you are actually taking and not ones you've simply considered.
Then on the other side, list what a person would do if that individual were deadly serious about achieving that goal; e.g., had to accomplish the mission to save a life or win a fortune.
Ponder the differences between the two lists and ask yourself, "Why aren't I acting more seriously?