1559.It is an implication of theism, according to which...

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It is an implication of theism, according to which God is the Creator of all things (thereby acting not simply voluntarily and without impediment, but freely and creatively so as to determine the otherwise indeterminate), that free and creative activity is the universal principle of actuality. Why? 

Well, because if God as supreme reality consists in supreme freedom and creativity, all lesser realities must be lesser--but not zero--forms of the same freedom and creativity. Thus all creatures must have some freedom and creative power to determine what is otherwise indeterminate; and unqualified determinism, in the sense of the denial of such freedom and creative power, is implicitly contradictory of theism (cf. AD: 207).