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.
With the attempt of the Islamic academy of Germany, the magnificent meeting of common prayer of the followers of the Ibrahim religions was held in Hamburg in Ramadan Month in the July 14th 2014 in order to establish peace and safety in the world and to pray for the oppressed people in Gaza, Iraq, Syria and Bahrain.
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