Uncertainty that comes from knowledge
(knowing what you don't know)
is different from uncertainty coming from ignorance.
- Isaac Asimov
As soon as man does not take his existence for granted,
but beholds it as something
unfathomably mysterious, thought begins.
- Albert Schweitzer
That sense of sacredness,
that thinking in generations,
must begin with reverence for this earth.
- Paul Tsongas