John Trapp on Psalms 78:57

Verſ. 57. But turned back, &c.] They had a kind of willingneſs and velleity, a kinde of wambling, as one ſpeaketh, but it boyled not up to the full height of reſolution for God.

They were turned aſide like a deceitful bow] Non ſemper feriet quodc[illegible: 2 letters] que minabitur arcus, but a deceitful bow, that turneth back into belly, as we ſay, will be ſure to deceive the Archer, though he level his eye and his arrow never ſo directly to the Mark, and think with himſelf to hit it. Lo, ſuch a falſe rotten bow is mans deceitful heart; and hence the arrows of his purpoſes and promiſes vaniſh oft in the air as ſmoke.