Famous quotes containing the words unknown and/or sister:
“The process of discovery is very simple. An unwearied and systematic application of known laws to nature causes the unknown to reveal themselves.”
—Henry David Thoreau (1817–1862)
“My sister and I, you will recollect, were twins, and you know how subtle are the links which bind two souls which are so closely allied.”
—Sir Arthur Conan Doyle (1859–1930)