Discipline is contagious

If you live with roommates, notice how you’re sink gets dirty.

If you consistently clean them as soon after you’re done eating, you’ll notice that other people often follow that example if you tell them you appreciate a clean sink.

However, as soon as you start to leave a dish in there for a day or two, others will follow your lead.

The same principle applies to many other habits — you can set the tone for others.