وَأَمَّا الأَعْمَالُ أَيِ الطَّاعَاتُ، فَهِيَ تَزَايُدٌ فِي نَفْسِهَا
Acts of obedience can increase or decrease in themselves.
Are prayer, fasting, and other acts constituent parts of faith's essence or its obligations, perfections, and fruits? The answer differs among schools. The theological account emphasized here defines the essence through assent and connects deeds to faith as its serious consequences.
This does not make deeds optional. Religious duties remain binding and sins remain wrong. The technical question is whether a lapse in action necessarily extinguishes the underlying inward affirmation.