وَلَا تَثْبُتُ قَدَمُ الْإِسْلَامِ إِلَّا عَلَى ظَهْرِ التَّسْلِيمِ وَالِاسْتِسْلَامِ
One’s footing in Islam is established through acceptance and surrender.
Reading the terms: Taslīm expresses accepting revealed truth; istislām emphasizes yielding and submitting to it.
Boundary of meaning: Submission does not abolish reason; it guards against inventing unseen modalities or denying established revelation without warrant.
Takeaway: Belief is stabilized through acceptance and submission.