Psalms 71:15

My mouth shall shew forth thy righteousness and thy salvation all the day; for I know not the numbers thereof.

The words belong to Hezekiah's plea to God when he was facing death. In that extremity he placed his trust in God rather than yielding to despair. His prayer joined confidence in divine power with a longing to live so that he could bear witness to it. What he desired was to declare that power to the generations to come.