Observations always involve theory.

Wisdom cannot be directly transmitted, and does not readily accumulate through the ages.

All nature is a vast symbolism: Every material fact has sheathed within it a spiritual truth.

The history of astronomy is a history of receding horizons.

I knew that even if I were second or third rate, it was astronomy that mattered.

Observation always involves theory.

The great spirals, with their enormous radial velocities and insensible proper motions, apparently lie outside our Solar system.