12 For the word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.This, in my opinion, is the ultimate goal for thinking critically. It is the basis for making sound decisions. The context for this verse in this section of Hebrews is 'entering into the rest'. God desires rest and peace for His people and it requires thought, intent and energy that comes from God.
God designed the human mind to think, feel, motivate, and stimulate action. In Ephesians 6:17, we are told to "take the helmet (why the helmet?) of salvation (wholeness) and the sword of the spirit, which is the word of God"! The result of putting this all together is the true rest.