Most decisions must be made beforehand. You cannot wait till that situation comes and then you think about it.
For example, if you haven't decided what time you want to wake up in the morning...
INT. YOUR BEDROOM - 7AM
You are fast asleep on your bed when the alarm clock starts
blaring its wake up call.
Hmm... 7am... I wonder whether I can sleep in?
I do have to do get my laundry from the washing machine.
But this bed feels so nice...
That is just an innocent example. What would happen if you get in a compromising position of being tempted? A hot beautiful sexy woman appears in your bedroom? You'll probably only have 2 clear seconds to think before other parts of your body start doing your thinking for you.
What happens when you are being stressed? Someone begins to say something that is sure to push your buttons? Again, you may only have a second or two before your emotions start to rush in and take over.
That's one of the reasons why quiet time is important, it prepares you for the decisions both large and small that will come about during the coming days, weeks, months and years ahead. When you read the Bible about Joshua or about Joseph, learn about the principles on which they made their decisions and practice in your mind the same things.