What does the courtiers having entered brought furnaces and massy hammers and welded the bolts They resolved to leave means neither of ingress or egress to the sudden impulses of despair mean?

The passage describes courtiers who, armed with furnaces and heavy hammers, are determined to seal off a space completely, leaving no means for entry or exit. This act symbolizes a desperate attempt to control or contain overwhelming emotions, particularly despair. By welding the bolts, they effectively prevent any sudden impulses or chaotic feelings from escaping, emphasizing a desire for order amidst turmoil. The imagery conveys the tension between confinement and the natural human response to despair.