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These walls are kind of funny. First you hate 'em, then you get used to 'em. Enough time passes, gets so you depend on them. That's institutionalized. They send you here for life, that's exactly what they take. The part that counts, anyways.
— Red ‧ The Shawshank Redemption

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker describes how confining walls change from hated to familiar to needed, and calls that dependence being institutionalized. In this view, a life sentence takes the part of a person that matters most. The remark is rueful, showing how confinement can reshape what someone can live without.
Context reviewed