Hebrews 4:12 (New International Version 1984, ©1984)

 ¹² For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.

From BibleGateway.com: http://www.biblegateway.com/passage/?search=Hebrews 4:12&version=NIV1984