Whatever is considered as rules in the Islam has advisability. Even when two rules are in contrast with each other, advisability is considered. For example, when a person is obliged to fulfill two different actions, saving the life of a person and preserving the wealth of the person, if there is a dilemma in saving the life of a person and preserving his wealth, saving his life will be prior to preserving his wealth according to the advisability of practical wisdom.
Mohamad Ali Shomafi is author of Self Knowledge (2006), Ethical Relativism: An Analysis of the Foun¬dations of Morality (200 I)
طَلَبُ العِلمِ فَریضَةٌ عَلی کُلِّ مُسلِمٍ، اَلا اِنَّ اللهَ یُحِبُّ بُغاةَ العِلمِ .
Seeking knowledge is obligatory on every Muslim, Allah loves knowledge seekers.
Enough Principles: C 1, Chapter II, p 35