It says in al-‘Aqeedah at-Tahhaawiyyah wa Sharhuha (1/231):

With regard to the words *“The foot of Islam cannot be steadfast except on the basis of acceptance without questioning and of surrendering”* :

This is a metaphor; the physical foot cannot be steadfast except on some surface. What is meant is that commitment to Islam cannot be steadfast unless the individual accepts the texts of the Qur’an and Sunnah and submits to them, without questioning them or opposing them on the basis of his opinion, rational thinking and analogy. Al-Bukhaari narrated that Imam Muhammad ibn Shihaab az-Zuhri (may Allah have mercy on him) said: *Allah sends the message and the Messenger conveys it; our role is to accept and submit. This is a comprehensive and beneficial statement.* End quote.