His words had been too many to fit into a notecard.
(I'm using had been instead of were because it's a past-tense narrative. And the person is already dead.)
What puzzles me is that the phrase words had been too many has no results on Google. Zero.
Why is this? Is there a grammatical mistake? Or people just tend to use were even in the past tense, even if the person is no longer alive?
Same with thoughts:
His thoughts had been too many to fit into a notecard.