In addition to the important ideas expressed above, the Declaration contains a few other important ideas.
First, the Declaration contains the idea that if the government must be overthrown, a new government must be set up to safeguard the first three conditions, equality, God-given rights of the "life, liberty, and the pursuit of happiness." In other words, contained within the Declaration is the idea that a subsequent revolution must incorporate the principles of the first revolution, not simply be a justification to devolve into anarchy or some form of despotism.
Second, the Declaration cautions us that a subsequent revolution may not be undertaken lightly, that only when "a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute Despotism" would another revolution be justified.