The change of pace of the market

I found this excellent passage in a poker book:

Be sure to mix up your game, though, so you don’t become too predictable. That’s another of your authors’ faults: We don’t change our games enough, which lets our opponents get a good read on our hands. As Doyle Brunson, the grand old man of poker, wrote in Poker Wisdom of a Champion (Cardoza, 2003):

"Shifting gears means playing super-aggressively, then changing to a slower, more selective game while your opponents continue to play according to the pace you’ve set. They’re not aware that you’ve shifted —only you know for sure. Brunson’s advice applies best to no-limit games, but it’s true at every limit. You want your opponents to have to guess what you have, because sometimes they’ll guess wrong."

From p.223 of Winning Secrets of Online Poker by Frye and Frye (2005).