The lakeside cottage became his own Walden, where he lived peacefully with nature.

Walden 是专有名词，指美国作家梭罗(Henry David Thoreau)隐居的瓦尔登湖，后来成为"远离尘嚣、回归自然生活"的象征。这个词在句中用作比喻，表示"与自然和谐相处的隐居地"。