“Furthermore, believers must consider the urgency of the “today” referenced by the Psalmist and repeated here in Hebrews. “The psalm allows for the author to heighten the urgency of how one will respond to the word ‘today’ by calling attention to the Christian cultural knowledge that there are a limited number of ‘todays’ left before God tears into the fabric of human history to execute judgment and bestow rewards” (cf. 10:25, 37-39; 12:26-28). ”

— David DeSilva, Perseverance in Gratitude: A Socio-Rhetorical Commentary on the Epistle “to the Hebrews” (Grand Rapids, MI: Eerdmans, 2000), 149.