The novice should invoke with perfect force and respectful veneration. La ilaha illa llah should rise from above the navel. By the phrase la ilaha, he should intend excluding from the heart what is other than-God. By the phrase illa llah, he should intend uniting the formula with the cone-shaped physical heart so as to fix illa llah firmly in the heart and let it flow throughout all the members of the body, causing the meaning of the invocation to be present in his heart at every instant.
- Ibn Ata Allah, The Key to Salvation, p. 70