Full Idea
Induction expresses our hopes that similar causes will have similar effects.
Gist of Idea
Induction relies on similar effects following from each cause
Source
Willard Quine (Natural Kinds [1969], p.125)
Book Reference
Quine,Willard: 'Ontological Relativity and Other Essays' [Columbia 1969], p.125
A Reaction
Some top philosophers are also top teachers, and Quine was one of them, in his writings. He boils it down for the layman. Once again, he is pointing to the fundamental role of the similarity relation.