MANKIND being originally equals in the order of creation, the equality could only be destroyed by some subsequent circumstance
In this sentence I think what Paine is saying is that everyone is born and created equal and that factors like how wealthy or poor we are , are just circumstances .
As a long and violent abuse of power, is generally the Means of calling the right of it in question (and in Matters too which might never have been thought of, had not the Sufferers been aggravated into the inquiry) and as the King of England hath undertaken in his OWN RIGHT, to support the Parliament in what he calls THEIRS, and as the good people of this country are grievously oppressed by the combination, they have an undoubted privilege to inquire into the pretensions of both, and equally to reject the usurpation of either
In the first line , Paine says that ideas that go against tradition usually come with the idea of resistance at first . But as time goes on , People start to question authority when it starts to become abusive . He says that both the British King and parliament have been acting unfair to the American people .(Paine)