according to the proverb, the weak in courage is strong in cunning.
 William Blake, The Marriage of Heaven and Hell (1790). copy citation

Context

“The Giants who formed this world into its sensual existence and now seem to live in it in chains, are in truth, the causes of its life & the sources of all activity, but the chains are, the cunning of weak and tame minds, which have power to resist energy. according to the proverb, the weak in courage is strong in cunning. Thus one portion of being, is the Prolific, the other, the Devouring: to the devourer it seems as if the producer was in his chains, but it is not so, he only takes portions of existence and fancies that the whole.” source