I think the article is incorrect on this though, try always and tell the truth is a perfectly fine albeit slightly anachronistic usage that would mean
Whatever you do you must always try (that is to say not give up), and tell the truth.
One might also assume that you should tell the truth about trying always is the meaning, but at any rate it is not a phrasing that would be out of order a few hundred years ago.
I think the article is incorrect on this though, try always and tell the truth is a perfectly fine albeit slightly anachronistic usage that would mean
Whatever you do you must always try (that is to say not give up), and tell the truth.
One might also assume that you should tell the truth about trying always is the meaning, but at any rate it is not a phrasing that would be out of order a few hundred years ago.