It was hardly a year since they had come to live at Tipton Grange with their uncle, a man nearly sixty, of acquiescent temper, miscellaneous opinions, and uncertain vote. He had travelled in his younger years, and was held in this part of the county to have contracted a too rambling habit of mind. Mr. Brooke's conclusions were as difficult to predict as the weather: it was only safe to say that he would act with benevolent intentions, and that he would spend as little money as possible in carrying them out. For the most glutinously indefinite minds enclose some hard grains of habit; and a man has been seen lax about all his own interests except the retention of his snuff-box, concerning which he was watchful, suspicious, and greedy of clutch.
This sentence is from the passage.
"For the most glutinously indefinite minds enclose some hard grains
of habit."
What does the phrase hard grains of habit refer to in this passage?
1. Mr. Brooke is a man of "miscellaneous opinions."
2. Mr. Brooke "had travelled in his younger years."
3. Mr. Brooke is "as difficult to predict as the weather."
4. Mr. Brooke "would spend as little money as possible."