Psalms 71:20

Thou, which hast shewed me great and sore troubles, shalt quicken me again, and shalt bring me up again from the depths of the earth.

God brings renewed life and restoration after showing great and painful troubles. The one who has been brought low is quickened again and raised up from the very depths of the earth. Even in old age the speaker keeps his trust in God to revive him. Out of that reviving he continues to testify to God's power and faithfulness.