Upon returning to New York after defeating the Detroit Tigers in the 1907 World Series, Frank Schulte spoke to The Syracuse Post-Standard, and said manager Frank Chance was primarily responsible for the win:
“The unanimous opinion among the team regarding Frank Chance is that he is the best baseball manager doing business today…It shows from the beginning his clear head in building up his club to the perfectly oiled machine that the critics agree it is at present. The full credit for the success of the Cubs must be given to Frank Chance. The burden has been upon his shoulders and he has carried it as no other man could.”
Schulte
Schulte said Chance was constantly aware that the 1906 club had let down after winning 116 games in the regular season and lost the World Series to the Chicago White Sox four games to 2:
“He was firmly convinced that our defeat in the post season series of 1906 was due, at least partially, to our perceptible letdown after we had the pennant clinched. That there was such a letdown was widely recognized, and we felt the effects of it after we ran against the Sox. I do not say that we could have beaten the Sox last year, for they had a fine team, but I do claim that we could have nearer it if everybody had been on his toes, as he should have been…This year Chance was fully alive to the emergency. From the beginning to the end of the season he had us instilled with the nervous spirit of race horses…When the National League pennant was clinched was there any let down? There was wide comment about the difference in this respect between 1907 and the previous year.”
Schulte said Chance never stopped riding the team after they clinched the pennant:
Chance
“(H)e kept hot after us…He called attention repeatedly to the splendid fight being made in the American League; he reminded us of the issue the year before. He kept close after every man, seeing to it that each player was at his best and living in a way to keep so.
“He insisted upon the observance of strict training rules, he coached every man for every conceivable weakness in his play that would be apt to make trouble in the post season series. When he turned his team loose for the final showdown every man was fit for the game of his life, and the records show just what kind of baseball was in the Chicago crowd for that series. The fans sat up and took notice.”
Schulte said the “quite a little knocking” done of the Tigers, who dropped four straight to the Cubs after a first game tie, was unfair:
“The Detroit Tigers of 1907 formed a splendid team, and whoever would pretend to deny it is ignorant of the rudiments of baseball. Let people say what they will, the fact is this: The Cubs did not breathe wholly freely until that last game had been won, for we realized at all times that we had a formidable foe to contend with. We realized too, that luck favored us in generous proportion.”
Chance, Schulte and the Cubs repeated in 1908, beating the Tigers four games to one in that series.
Baseball History Daily 
In 1906, the Cubs clinched the pennant on Sept. 16. Their record after that (for the regular season) was 11-4. Some letdown, Mr. Schulte.