The given statement is associated with T.S. Eliot's essay on the metaphysical poets.
T.S. Eliot praised the metaphysical poets for their unified sensibility.
According to Eliot, poets like John Donne could combine thought and feeling together.
The phrase:
\[
\text{``mechanism of sensibility''}
\]
refers to the ability of the metaphysical poets to absorb varied experiences and convert them into poetry.
Eliot contrasted this with later poets, where he felt that a dissociation of sensibility had taken place.
Therefore, the critic who made this statement is:
\[
\text{T.S. Eliot}.
\]