Here are the words from Virgil (as Reason) as they’ve started the climb, but the Pilgrim is too distracted by what the other souls might be whispering:
“Keep up with me and let the people talk!
Be like a solid tower whose brave height
remains unmoved by all the winds that blow;
the man who lets his thoughts be turned aside
by one thing or another, will lose sight
of his true goal, his mind sapped of its strength.”