The best portion of a man’s life is his little, nameless, unremembered acts of kindness and love.
– William Wordsworth
While these little acts of kindness may be unremembered by William, I am sure they were never forgotten by those he was kind to.
I know I will never forget those instances where someone, often a perfect stranger, was kind to me.
post script: A note on the Grammar here: It is entirely correct to say “is” instead of “are”, because it agrees with the singular “portion”. However, I’m pretty sure nowadays you’d get “are” written, because it ‘sounds’ right; agreeing with the plural list that follows.