there exists in the human mind and indeed by natural instinct, some sense of Deity, we hold to be beyond dispute, since God himself, to prevent any man from pretending ignorance, has endued all men with some idea of his GodheadInstitutes, 1.3.1
Knowledge of God never needs to be instilled in people by coercion or violence, nor by logical argumentation or compelling proofs, but belongs to humans by their very nature and arises spontaneously and automatically.Reformed Dogmatics
Natural theology is not natural revelation. This is important to stress because natural theology and natural revelation are often conflated togetherFailure of Natural Theology, 10