I know that if I start my day off with some quiet time praying and reading God's Word then I will have a better day than if I don't. The problem is that some days I choose a little extra sleep over getting up before everybody else, or some days my daughter gets up earlier than expected and then I don't get the quiet time I was planning to have.
I try not to make my quiet time a "check off the list" thing, but more a mindset for my day. If I start my day talking with Him, I'm more likely to focus on Him all throughout the day. Now, if I could only figure out a way to make Him the focus on the days that I don't get the quiet time.
Whether I start my day with Him or not, He is with me always and will never leave me or forsake me.