Sentence:  But now Thou dost Thyself immure and <WSD>close</WSD> / In some one corner of a feeble heart; / Where yet both Sinne and Satan, Thy old foes, / Do pinch and straiten Thee, and use much art / To gain Thy thirds' and little part. 
Meaning of the word marked with <WSD> tags:  To come or gather around; to enclose; to encompass; to confine.