by Una Hearne. A lot of time management courses are rubbish because they don't establish the most important principle before they show you their techniques and tools. Here's the most important principle: You need to know what is important to you, what really matters in your life, in order to choose wisely what you spend your time on. You have a finite amount of time in your life. You don't know how long you have. You can't 'make' any more time. The power and control you have in this area is in how you choose to use the ...