At the last dim horizon, we search among ghostly errors of observations for landmarks that are scarcely more substantial. The search will continue. The urge is older than history. It is not satisfied and it will not be oppressed.

Equipped with his five senses, man explores the universe around him and calls the adventure Science.

The universe is unfolding as it should.

Astronomy is something like the ministry. No one should go into it without a call. I got that unmistakable call, and I know that even if I were second-rate or third-rate, it was astronomy that mattered.

Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation.

Observations always involve theory.

Observation always involves theory.