Sentence:  How you can bear such recollections, is astonishing to me!—They "will" sometimes <WSD>obtrude</WSD>—but how you can court them! 
Meaning of the word marked with <WSD> tags:  To become apparent in an unwelcome way, to be forcibly imposed; to jut in, to intrude ((on) or (into)). (from 16th c.)