Probably the hardest of all things to think about and define for yourself is what things, people, achievements are the most important for you. Making sure that nothing is important could be important to you, something is always important.
Its probably true that if you don’t define what is important to you then someone else will do it for you. If you don’t set your intentions and your direction someone else will influence, direct or demand you follow their will and do what is important for them, this is fine if it is also important to you but if its not important to you, well then its not important!
If you are lucky whats important will seem obvious, over time what is important may require more thought, its always good to write down where you want to be in 5 years because you are more likely to get there.
The ultimate definition of what is important is writing down what people would say about you at your funeral – it sounds far away but life is finite and has an end, so why not think about that end and what you want it to be.