Why does Allah test His servants with different and unequal tribulations among people, even though the ultimate destiny is one? And is that considered justice?

The injustice that Allah the Almighty is free from is disposing of another's property without their permission, or disobeying His command, and this is impossible for Him, because He is the Owner of all things and there is no commander above Him. The Ahl al-Sunnah (Sunnis) said: Injustice is putting something in a place other than its rightful place. The injustice that Allah has forbidden upon Himself is the injustice related to recompense, meaning that He recompenses the servant only for their deeds, does not punish the innocent, does not punish anyone for another's sin, and does not judge between people except with justice, because Allah is free from attributes and actions of deficiency and defect.

Injustice in this world is only realized by putting something in a place other than its rightful place, and this can never happen in Allah's judgment. However, due to the limitations of our knowledge, we do not comprehend many instances of wisdom.

Allah the Almighty tests every servant with what suits His wisdom, because He is the One who knows the qualifications of His servants and their apparent and hidden attributes, and what is suitable for determining their destiny. And trial may be for elevating the servant's status with Allah.

The variation in types and degrees of trials brings forth from the servant the two acts of worship: gratitude and patience. No one is in perfect health from all evil, or has been given all types of blessings; rather, variation and opposition are the dominant characteristics.

To understand Islam, one must refer to the Noble Qur'an and read its meanings and interpretations, for in it is what clarifies that Allah is free from injustice, and establishes for Him perfect wisdom and all attributes of perfection, and this is sufficient to refute doubts.