means when you start the day you already know what exactly you want to accomplish that day. and you will put all your focus and attention on those ten tasks and in particular, the two objective tasks that you have chosen must get done that day.
now the reason why you do this the night before instead of on the morning of the day itself is so when you start the day you already know exactly what it is you should be doing. there’s no chance you will waste any time thinking about what to do, or get yourself lost in a sea of tasks you might like to get done. 