For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart.
The word of God is powerful to a point of separating the 3 realms that encompasses a human being: Spirit, Soul and Body.
From this verse: soul and spirit is direct whereas joints and marrow represents the body.
The word also discerns the thoughts and intents of the heart. In this manner therefore:
The things we do in Speech (Spirit and Heart), the things we do in thought ( soul/mind), the things we do in action (body), the motives of our heart with is a direct overflow of what is within us.
The more you study the word, is the more God deals with the issues of the heart that may be disturbing you.
This day ask God to search your heart through His word. Let everything that is not of Him in your life be exposed and eradicated for His Glory.