The second pasuk of the Zayin segment (119:50) of Mizmor 119 was posted on Erev Shabbos, Pashas Acharei Mos.
Having called upon Hashem to fulfill His ancient promise and having related that promise to his hope for the future, David now emphasizes again how important that promise has been to him. Essentially it has become the focal point of his life, for even though David has experienced much suffering , the promise provides assurance that his travails will be coming to an end. David describes how he draws comfortand strength from the knowledge that fulfillment of Hashem’s promise is just a matter of time. His trust in Hashem’s word is his guarantee of life.