The writer is either a practicing recluse or a delinquent, guilt-ridden one.
薄:挑剔,贬低。訾:贬斥。贬低我商品的人,是想和我做生意;贬斥我品行的人,是想和我交朋友。
To solve a problem, one must first understand its nature and then find the right tools to tackle it.