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.
"The status of women in Islam and Christianity, Through the character of Saint Mary"
By Nadia Jamil
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