Calvinism is derived systematically from Scripture. By definition (of systematic theology) Calvinism is dependent on scripture and extra-biblical sources. Extra-biblical sources include philosophy, cultural influences, contemporary issues (at the time of development), prior theological writings and opinions (historical theology), and human reasoning.
One thing to remember – Calvinism as the Doctrines of Grace, TULIP, or the Canons of Dort were not self-standing expressions or complete theological formations. The Canons of Dort were a response to and rebuttal of the Five Articles of the Remonstrance which were articles put forward by then-Calvinists concerning the philosophical question predestination as it relates to the problem of evil.
Is Calvinism Theology or Philosophy?
Calvinism itself, as defined by “the Doctrines of Grace” or TULIP is not a theology but rather a religious philosophy associated with the branch of theology called soteriology (the study of salvation). This does not make Calvinism wrong, but it would be wrong to refer to Calvinism itself as a study of salvation (as a soteriology) and even more incorrect to refer to Calvinism as a theology.
Historical Calvinism, on the other hand, as defined by the system of belief held by John Calvin and further developed by Theodore Beza is a theology and Calvin’s Institutes is a Systematic Theology. The soteriology within Calvinistic Theology is more developed and complex than the issues of divine predestination within salvation (than Calvinism as a religious philosophy).
Calvinism as we use it (TULIP or the Doctrines of Grace) begin with Historical Calvinist’s answer to the Remonstrates concerning the philosophical question of predestination and the problem of sin.
What philosophical presuppositions is Calvinism built upon?
The most obvious starting point for Calvinism is the assumption that one philosophy of justice, retributive justice, is descriptive of divine justice and how God deals with man in a moral sense.
Another equally important but perhaps less on the surface is the philosophy concerning types of substitution and punishment. There are two primary ideas of punishment. They are punishment as healing or preventing evils and punishment as retribution or balancing out the wrong done. Aquinas argued that an innocent man could justly be punished in the place of a guilty man (provided all parties were in agreement) BUT no man can justly be punished for the sins of another. John Calvin was trained as a lawyer rather than a theologian. When he reformed Aquinas’ position he decided that an innocent man could not only be punished for a guilty man, but also that he could be punished for the sins of the guilty man.
Linked with the two is the philosophical idea that sin can be treated as a thing and this thing be spoken of independently of the sinner. Sins, therefore, can be transferred from one person to another person. Sins themselves can be punished. Those two things being assumed, sins can be transferred from one person to another person and punished on or in that other person. This can be viewed as just based on Calvin’s reworking of Aquinas’ idea of atonement.
There are many other philosophical and theoretical ideas upon which Calvinism is built. One is the assumption that moral justness is at the heart of God’s work of reconciliation. Another is that righteousness is a moral (rather than relational). And of course, there are many others. But I think what is listed is at the very foundation of Calvinism.