If our actions are not supreme, and their results are ordained by the higher principle governing all Laws of the Universe, then is it all simply destined? Are we all just the puppets to the puppeteer’s whims and fancies?

No. Because we choose the actions we perform and how we perform them. Destiny then works as the Law of Action. But remember that our little actions are part of a bigger picture. So, keep pride at bay, and feel humility and divinity’s grace in the parts we do get to play and accomplish.