Halton Arp quotes:

I gloomily came to the ironic conclusion that if you take a highly intelligent person and give them the best possible, elite education, then you will most likely wind up with an academic who is completely impervious to reality.

No matter how many times something has been observed, it cannot be believed until it has been observed again.

Of course, if one ignores contradictory observations, one can claim to have an "elegant" or "robust" theory. But it isn't science.

After all, to get the whole universe totally wrong in the face of clear evidence for over 75 years merits monumental embarrassment and should induce a modicum of humility.

Picture yourself during the early 1920's inside the dome of the Mount Wilson Observatory. ... Humason is showing Shapley stars he had found in the Andromeda Nebula that appeared and disappeared on photographs of that object. The famous astronomer very patiently explains that these objects could not be stars because the Nebula was a nearby gaseous cloud within our own Milky Way system. Shapley takes his handkerchief from his pocket and wipes the identifying marks off the back of the photographic plate.