Contagious enthusiasm. [ Mrs. Balfour ]

Example is contagious behavior. [ Charles Reade ]

Poetry is evidently a contagious complaint. [ Washington Irving ]

There are follies as catching as contagious disorders. [ La Rochefoucauld ]

It is certain that either wise bearing or ignorant carriage is caught as men take diseases, one of another. [ William Shakespeare ]

Vigor is contagious; and whatever makes us either think or feel strongly adds to our power and enlarges our field of action. [ Emerson ]

No company is far preferable to bad, because we are more apt to catch the vices of others than their virtues, as disease is far more contagious than health. [ Colton ]

Exaggeration is not only one form of falsehood, it is one of its worst forms: since the swollen and contagious body gains admission by walking in upon healthy legs. [ Berz ]

I was always an early riser. Happy the man who is! Every morning day comes to him with a virgin's love, full of bloom and freshness. The youth of nature is contagious, like the gladness of a happy child. [ Edward Bulwer-Lytton ]

Nothing is so contagious as enthusiasm; it is the real allegory of the tale of Orpheus; it moves stones, it charms brutes. Enthusiasm is the genius of sincerity, and truth accomplishes no victories without it. [ Bulwer ]