The more I read the Proverbs, the more I suspect that our grandparents must have read them too. Think of that older, wiser person from your past who warned you about how carefully you should pick your friends, and how you should be selective in the company that you keep. Their advice to us was probably a modern interpretation of Proverbs 13:20.
Whoever walks with the wise becomes wise,
but the companion of fools suffers harm.
In the second half of this Proverb we are reminded of the threat of guilt by association. The first half speaks of osmosis, imitation, and just good old common sense. Hang around some wise (godly) people, and something good might rub off on you.
Help me pick those people who will fill my time today, so that I will end a little wiser (or at least safe from harm.) Amen.