John Trapp on Psalms 141:3

Verſ. 3 Set a Watch, O Lord, before my mouth] Orat pro patientia; ſaith One, here hee prayeth for patience; leſt by giving himſelf leave to over-laſh, hee make the matter much worſe. The beſt patience long tryed, and hard put to't, may miſcarry, to its coſt.

Keep the door of my lips] That it move not creaking, Dal pro Deleth per Apo[illegible: 1 letter]cp[illegible: 1 letter]n poc[illegible: 1 letter]icam. and complaining as on ruſty hinges, for want of the oil of joy and gladneſs. David had ſomewhat to do with his tongue, as wee ſee, Pſal. 39.1.3. and when hee had carted the Ark, how untowardly ſpake hee, as if the fault were more in God than himſelf, that there was ſuch a breach made in Uzzah, 1 Chron. 15.2? It was but need therefore thus to pray.