daij enwiktionary kojien saito chujiten (as "徳は孤ならず")

as always with quotes based in Confucius: there's a 
whole lot of English translations about, e.g.
"The virtuous man is not alone; his virtues will ever be 
his companions"
"The virtuous man is not alone; he will always have 
neighbors."
"Virtue is never alone; it always has neighbors"
or in Thoreau's Walden(!), as
"Virtue does not remain as an abandoned orphan; it must 
of necessity have neighbors"