Sentence:  Since, therefore, the science of natural philosophy is conversant about the works of the Almighty, and its investigations have a direct tendency to illustrate the perfections of his nature, to <WSD>unveil</WSD> the plan of his operations, to unfold the laws by which he governs the kingdom of universal nature, and to display the order, symmetry, and proportion, which reign throughout the whole. 
Meaning of the word marked with <WSD> tags:  To remove a veil from; to uncover; to reveal something hidden.