When you are just beginning to deliberately manage the frequency of your being (your thoughts and feelings), you may find there are some ups and downs, and that you are jumping from one frequency to another.
This stage is so short, and in no time at all you will begin to stabilise on higher frequency, and then a higher frequency, forever climbing higher and higher.
It took some practice to walk, didn't it? But with determination you did it. There is no difference.
Source - The Secret - Daily Teachings (by Rhonda Byrne)