If I have seen further it is by standing on the shoulders of Giants.
Letter to Robert Hooke (1676)
I keep the subject constantly before me, and wait 'till the first dawnings open slowly, by little and little, into a full and clear light.
Reply on how he made his discoveries, Biographia Britannica (1760)
Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things.
Rules for methodizing the Apocalypse, manuscript
To myself I seem to have been only like a boy playing on the sea-shore... whilst the great ocean of truth lay all undiscovered before me.
Quoted in David Brewster, Memoirs of Sir Isaac Newton (1855)
If I have done the public any service this way, 'tis due to nothing but industry and a patient thought.
Letter to Richard Bentley (1692)