What is khair

Khair (good) namely: the affair which has a higher priority and  according to rational, religious and divine system is called khair (good), otherwise  it is called Shar (evil).

What factor causes that a person to confuse distinguishing the difference between khair (good) and Shar(evil)?

Condolences on the anniversary of the martyrdom of Imam Musa Kazim (P.B.U.H.).  The seventh Imam

Perhaps lack of realizing which activity is more important to be done first. In other words, being weak in giving priority to activities.

Perhaps delaying in doing good work at its right time. That is, to put off an activity due to either lack of attention to its importance or time mismanagement.

As Hazarte Fatima states in today's invocation, we may fail in realizing our poorness towards Divine Richness. In other words, because of our ignorance or impatience, we may go astray from the right path. Consequently,  it would be hard to differentiate which activity is khair [good]  to do or shar [evil] not to do.