Imbued with a vernal freshness [vernal = resembling spring; fresh]
Immense and careless prodigality
Immense objects which dwarf us
Immersed in secret schemes
Immured in a trivial round of duty [immured = confine within]
Impassioned and earnest language
Impatient and authoritative tones
Impervious to the lessons of experience
Implying an immense melancholy
Imprisoned within an enchanted circle