Charles Ellicott Commentary Psalms 71:15

"My mouth shall tell of thy righteousness, [And] of thy salvation all the day; For I know not the numbers [thereof]." — Psalms 71:15 (ASV)

Compare Psalms 40:5, which indicates the meaning here. Mere reminiscence must give place to actual calculation, which also must fail before the sense of Divine interference in his favour.