Just think o' your body, O brave and tender youth! It is like a sponge.

How it takes things in an' holds 'em an' feeds upon 'em! A part o' every apple ye eat sinks down into yer blood an' bones.

Ye can't get it out.

It's the same way with the books ye read an' the thoughts ye enjoy.

They go down into yer bones an' ye can't get 'em out.