Curiosity is one of the permanent and certain characteristics of a vigorous intellect.

Curiosity is, in great and generous minds, the first passion and the last

...avoidance of small mistakes makes the large ones more severe.

My mother was a first-grade teacher, so I credit her with this lifelong intellectual curiosity I have, and love of reading and learning.

Nothing has more retarded the advancement of learning than the disposition of vulgar minds to ridicule and vilify what they cannot comprehend.

Curiosity is one of the most permanent and certain characteristics of a vigorous intellect.