The obligation to seek knowledge does not mean that everyone must master every scholarly specialization at once. The knowledge one needs depends in part on one's actual responsibilities.
Examples:
1. A person who prays needs to learn the essential conditions and manner of prayer.
2. Someone who trades should understand relevant basics of honest and lawful transactions.
3. Anyone entrusted with a duty should learn the associated rights and requirements.
كُلِّ مُسْلِمٍ has a general scope, “every Muslim,” but the particular knowledge required varies by subject and circumstances. Reliable scholars can clarify cases of uncertainty.