Oh ,what a tangled web we weave ,when first we practice to deceive.

这句话是 Sir Walter Scott, 1st Baronet 说的.他是18世纪晚期苏格兰著名的历史小说家和诗人.这句话是他有名的一首诗 Marmion 里的一句.含有这句话的那一段是:
Yet Clare's sharp questions must I shun,
Must separate Constance from the nun
Oh! what a tangled web we weave
When first we practise to deceive!
A Palmer too! No wonder why
I felt rebuked beneath his eye;
这句话是讲有关deception, 就是欺骗, 大概意思是应由欺骗而编织起来的网是很复杂, 很难解开的.