The first law of Newton states that an object remains in a state of rest or motion except a force is applied. Power is a measurement of energy with respect to time. Energy is a function of force. Things will remain the way they are except an external force act on it.
A king exercises his authority by his words. A king only gives out orders and it is carried out without the king moving a hand.
Where the word of a king is, there is power: and who may say unto him, What doest thou?
Ecclesiastes 8:4 KJV
The word of a king is power. It is an external force, which acts on prevailing situations around him. It can make things to continue the way they are if he is happy with it or make things to change course if he is not happy with it. If you like the way things are in your world, it takes the word of your mouth to make it continue. If you do not like it and you want a change, it takes the word of your mouth to make it stop and change it to what you want.
You should choose your words carefully because you are a king. A king is not careless with words.
Look at your world; where do you want a change. The external force needed is on your mouth because you are a king. Wherever the word of a king is there is power. You can effect that change in your life. In addition, those things you want to continue, you can sustain them and make them continue by the words of your mouth.