Full Idea
However often one experiences instances of a universal truth, one could never know inductively that it would always hold unless one knew through reason that it was necessary.
Gist of Idea
You may experience a universal truth, but only reason can tell you that it is always true
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 1.01)
Book Reference
Leibniz,Gottfried: 'New Essays on Human Understanding', ed/tr. Remnant/Bennett [CUP 1996], p.80
A Reaction
The problem, though, is that as soon as we go beyond experience we are not very reliable, and are liable to arrogance, error and lack of imagination.