There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.
Carl SaganWhenever our ethnic or national prejudices are aroused, in times of scarcity, during challenges to national self esteem or nerve, when we agonize about our diminished cosmic place and purpose, or when fanaticism is bubbling up around us - then, habits of thought familiar from ages past reach for the controls.
Carl SaganThe cannabis experience has greatly improved my appreciation for art, a subject which I had never much appreciated before.
Carl Sagan