Understanding causality is essential in everyday life because it shapes how people make decisions, assign responsibility, and anticipate outcomes. From simple actions such as taking medicine to relieve pain, to complex choices like implementing public health policies, people rely on assumptions about cause and effect. When these assumptions are unclear or mistaken, decisions may be ineffective or harmful. Reflecting on causality is therefore not merely philosophical, it directly affects daily routines, professional judgement, and ethical responsibility.
The classical philosophical discussion of causality begins with Aristotle in the 4th century BCE. Aristotle proposed that a complete explanation of anything requires four causes. The material cause explains what something is made of, the formal cause explains what makes it the kind of thing it is, the efficient cause explains what brings it about or produces change, and the final cause explains its purpose. These causes work together rather than separately. Aristotle assumed that causes have real power in nature. Under similar conditions, similar causes will tend to produce similar effects. Nature, in this view, is orderly, purposeful, and intelligible, and human reason can understand how it operates.
This understanding was critically examined within Islamic thought, most notably by Al-Ghazali in the 11th century CE, particularly in Tahafut al-Falasifah written around 1095. Al-Ghazali challenged the idea that natural objects possess intrinsic causal power. His critique focused on efficient causation and the notion of natural necessity. He argued that observing events occurring regularly together does not prove that one causes the other by itself. Fire does not burn by its own power, and medicine does not heal by itself. Rather, Allah creates both the apparent cause and the effect at each moment. The regularity observed in nature reflects divine custom, not independent natural necessity. Al-Ghazali did not deny purpose, but he rejected the idea that purpose is built into nature itself. Final causation, in his view, belongs to divine wisdom rather than autonomous natural processes.
Modern discussions of causality emerged strongly in the 18th century CE through the work of David Hume, especially his writings published around 1748. Hume argued that humans never observe necessary connections between events. What we observe are repeated patterns, from which we form expectations through habit. Causality therefore becomes an inference rather than a certainty. This view influenced modern science, where causation is treated as probabilistic and open to revision. Rather than claiming absolute certainty, science evaluates causal claims based on evidence, consistency, and explanatory value.
In applied sciences, particularly epidemiology, causality is evaluated using structured reasoning rather than philosophical proof. Austin Bradford Hill articulated this approach in 1965 by proposing considerations to assess whether an observed association is likely to be causal. These considerations accept uncertainty as unavoidable and focus on judgement rather than necessity. Causality in modern science is therefore practical, evidence-based, and aimed at guiding decisions rather than establishing metaphysical truths.
From a tawhidic perspective, Muslims engage with all these levels of causality while maintaining a clear theological position. Islam affirms that Allah is the ultimate cause of all events. Natural causes, regularities, and scientific laws are real at the level of human experience and reasoning, but they operate only by divine permission. This allows Muslims to accept empirical causality for evaluation and action, while rejecting the idea that nature possesses independent or self-sustaining power. Causality therefore operates at two levels, an observable level that supports scientific inquiry and decision-making, and an ultimate level grounded in tawhid, where all power, purpose, and outcome return to Allah.
In this way, causality is not rejected but properly ordered. Philosophy explains its structure, science evaluates it through evidence, and the tawhidic worldview places it within a coherent and meaningful understanding of reality and daily life.