The notion of formal maturity (al bulūgh al ṣūrī) is one of the innovative and underexplored concepts within the system of Transcendent Philosophy (Ḥikmat al Mutaʿāliyah). Although Ṣadr al Mutaʾallihīn introduces this concept for the first time and assigns to it a foundational role in explaining the developmental trajectory of the human soul, it has received little attention in post-Sadrian philosophical literature. In Ṣadrā’s view, formal maturity is not merely a biological or psychological stage, but rather an ontological rank within the soul’s process of intensification and existential perfection. It marks a decisive turning point in the soul’s substantial motion, wherein the human soul acquires new actualities that enable its transition toward higher perfections, especially spiritual maturity. Employing an analytical–deductive method and grounded in the principles of Transcendent Philosophy, this study seeks to reconstruct, systematize, and elucidate this concept and to clarify its place within Ṣadrā’s philosophical framework.
Within Ḥikmat al Mutaʿāliyah, the human soul is a graded and modulated reality whose genesis is corporeal and whose subsistence is spiritual. It originates from the body (ḥudūth jis̱mānī) and, through substantial motion (ḥarakah jawhariyyah), gradually ascends toward higher degrees of immateriality. Ṣadrā maintains that the soul, at the outset of its emergence, is identical with the body and belongs to the order of matter; yet through continuous existential intensification, it traverses the vegetative, animal, imaginal, and finally the rational and intellectual levels. Formal maturity is the stage at which the animal soul reaches the highest degree of imaginal intensity and becomes prepared to receive the rational soul and the intellectual faculties. Thus, formal maturity is not a fixed chronological moment but a gradational process that begins at birth and culminates at a specific existential threshold.
Ṣadrā describes formal maturity with expressions such as “animal maturity,” “the moment of the emergence of the rational soul,” “the stage of formal intensification,” and “the beginning of rationality.” He argues that from birth until formal maturity, the human being is a “human animal in act and a human being in potency”—possessing sensory and imaginal cognition but not yet having attained rational and intellectual actuality. At the onset of formal maturity, the rational soul comes into being, and the practical intellect becomes actual, while the theoretical intellect remains in its hylic (potential) state. This point constitutes one of the major theoretical challenges in interpreting formal maturity, for in the Peripatetic tradition, the theoretical intellect is considered prior to the practical intellect. Ṣadrā, however, insists on the priority of the practical intellect’s actualization. This study demonstrates that such priority arises from the existential nature of the practical intellect in Sadrian philosophy: the practical intellect is a mode of discernment and deliberation intrinsically tied to voluntary action and moral choice, and thus it attains an initial and rudimentary actuality from the very moment the rational soul emerges.
One of the most significant consequences of formal maturity is the transformation in the soul’s mode of attachment to the body. Ṣadrā holds that prior to formal maturity, the soul’s attachment to the body is an “existential and individuating attachment,” meaning that the soul depends on the body for its very existence and individuation. After formal maturity, however, this attachment becomes a “perfection-oriented attachment,” such that the soul no longer requires the body for its existential subsistence but employs it as an instrument for acquiring further perfections. This shift marks a profound ontological transition and reveals that formal maturity is not merely a biological development but a transformation in the very structure of the soul’s relation to embodiment.
From Ṣadrā’s perspective, formal maturity is the stage at which the human being attains incipient rationality—the capacity for thought, deliberation, judgment, and voluntary choice. The practical intellect is actual at this stage, enabling the human being to engage in moral and purposive action. The theoretical intellect, however, remains potential and can only reach full actuality through continued substantial motion and divine assistance. Hence, formal maturity is a necessary but not sufficient condition for spiritual maturity. All human beings reach formal maturity, but only a select few attain spiritual maturity and the actuality of the theoretical intellect.
This study further shows that although formal maturity provides the groundwork for spiritual ascent, it can simultaneously become the greatest obstacle to it. Ṣadrā explicitly states that at the height of formal maturity, the soul is intensely preoccupied with the body and the natural world; this deep immersion in corporeal concerns may distract the human being from its true origin and ultimate perfection. Thus, formal maturity is a dual-edged stage: on the one hand, it marks the beginning of rationality and the possibility of transcendence; on the other, it represents the peak of corporeal engagement and the risk of spiritual neglect.
The final section of the study examines the relationship between formal maturity, spiritual maturity, and juridical (sharʿī) maturity. Juridical maturity is a legal threshold of religious responsibility based on biological indicators, whereas formal maturity is an ontological stage defined by imaginal intensification and the emergence of the rational soul. Spiritual maturity, by contrast, is the stage at which the theoretical intellect becomes actual, and the human being attains the rank of the actual intellect and the sacred soul (al nafs al qudsiyyah). The study demonstrates that these three forms of maturity belong to distinct domains: juridical maturity pertains to legal obligation, formal maturity pertains to the emergence of rationality, and spiritual maturity pertains to the actualization of intellectual perfection.
In conclusion, this article reconstructs a coherent account of formal maturity by synthesizing the dispersed remarks of Ṣadr al Mutaʾallihīn and demonstrates that this concept constitutes the mediating link between the animal soul and the human rational soul, marking the initial emergence of rationality and volition. Formal maturity is the stage at which the human being acquires foundational actualities, without which the ascent toward spiritual and intellectual perfection would be impossible. By elucidating this stage, the study highlights the philosophical significance of formal maturity for understanding the developmental ontology of the human soul in Transcendent Philosophy.