be aware

References in classic literature ?
Hargrave; you ought to be aware that whatever my husband's faults may be, it can only aggravate the evil for me to hear them from a stranger's lips.
When we see an object, say a penny, we seem to be aware of its "real" shape we have the impression of something circular, not of something elliptical.
I also began to be aware that our theology has been both androcentric--man-centered--and anthropocentric--human-centered.