Full Idea
Falsification and verification are not logically equivalent. For example, you might verify the claim that there will be three consecutive sevens in the infinite expansion of PI, but you could never falsify such a claim.
Gist of Idea
Some things (e.g. a section of the expansion of PI) can be verified but not falsified
Source
report of John Hick (Theology and Verification [1960], §II) by PG - Db (ideas)
Book Reference
'The Existence of God', ed/tr. Hick,John [Macmillan 1964], p.258