Muslims must know 4 matters

In the name of Allah most merciful the bestower of mercy
know may Allah have mercy on you that we Muslims are obligated to learn 4 matters

firstly         Knowledge ; which means awareness of Allah    awareness of his prophet                        awareness of the religion of Islam based on the evidence
secondly   Acting on it
third           Calling to it
fourth        Patiences with the harm that befalls due to it

Surat Al-`Aşr

By time,

Indeed, mankind is in loss,

Except for those who have believed and done righteous deeds and advised each other to truth and advised each other to patience.