Neil deGrasse Tyson
Perhaps we've never been visited by aliens because they have looked upon Earth and decided there's no sign of intelligent life.
More quotes and aphorisms
If you see what is right...You must be a lotus, unfolding its petals...Every new beginning comes from some other...Consider what people think of you, but don't be afraid...You're never given a dream...Have you not noticed that love is silence?...