“Discovery is for forward lookers.”

Book I, ch. I, Departure - Passage from Plymouth to Madeira - Description of that Island.
A Voyage Round the World (1777)

New York Times interview (1985)

1970s, Synergetics: Explorations in the Geometry of Thinking (1975), Moral of the work
Context: It is one of our most exciting discoveries that local discovery leads to a complex of further discoveries. Corollary to this we find that we no sooner get a problem solved than we are overwhelmed with a multiplicity of additional problems in a most beautiful payoff of heretofore unknown, previously unrecognized, and as-yet unsolved problems.

Not only Planck but also other physicists were initially at a loss as to what the proper context of the new postulate really was.
Referring to the difficulties physicists experienced understanding the discovery that energy exchange is quantized, in Inward Bound : Of Matter and Forces in the Physical World (1988), p. 134

Source: Memoirs of Hadrian

Source: The Physiology of Taste: Or, Meditations on Transcendental Gastronomy

Statement upon being appointed as UC Berkeley chancellor in 1958, as quoted Biographical Memoirs (2000) edited by Darleane C. Hoffman, p, 252 <!-- ISBN 0-309-07035-X National Academies Press-->
Context: There is a beauty in discovery. There is mathematics in music, a kinship of science and poetry in the description of nature, and exquisite form in a molecule. Attempts to place different disciplines in different camps are revealed as artificial in the face of the unity of knowledge. All literate men are sustained by the philosopher, the historian, the political analyst, the economist, the scientist, the poet, the artisan and the musician.

reported by Lance Dixon http://www.preposterousuniverse.com/blog/2013/10/03/guest-post-lance-dixon-on-calculating-amplitudes/

Source: Writing Down the Bones: Freeing the Writer Within