What is the difference between "al-Qasitin" and "al-Muqsitin"?

The qasitun (القاسطون) are the unjust, and the muqsitun (المقسطون) are the just. Qusoot (القسوط) is injustice and deviation from the truth, and from it is the Almighty's saying: "And as for the qasitun, they were firewood for Hell." (وَأَمَّا الْقَاسِطُونَ فَكَانُوا لِجَهَنَّمَ حَطَباً) And qist (القسط) is justice, and from it is the Almighty's saying: "Indeed, Allah loves the muqsitun." (إِنَّ اللَّهَ يُحِبُّ الْمُقْسِطِينَ)