Your ability to select your ...

Your ability to select your most important task at each moment, and then to get started on that task and to get it done both quickly and well, will probably have more of an impact on your success than any other quality or skill you can develop.
Your ability to select your most important task at each moment, and then to get started on that task and to get it done both quickly and well, will probably have more of an impact on your success than any other quality or skill you can develop.

Quotes from the same author

Your success in life and work will be determined by the kinds of habits that you develop over time. The habit of setting priorities, overcoming procrastination, and getting on with your most important task is a mental and physical skill. As such, this habit is learnable through practice and repetition, over and over again, until it locks into your subsconscious mind and becomes a permanent part of your behaviour.
There is never enough time to do everything, but there is always enough time to do the most important thing.
Goals are the fuel in the furnace of achievement.
Whatever we expect with confidence becomes our own self-fulfilling prophecy.
You can only grow if you're willing to feel awkward and uncomfortable when you try something new.