Colossians 4:5-6

Be wise in the way you act toward outsiders; make the most of every opportunity. Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.

Be wise 
Ephesians 5:15  Be very careful, then, how you live--not as unwise but as wise, ...

in the way you act toward outsiders 
Mark 4:11-12  He told them, "The secret of the kingdom of God has been given to you. But to those on the outside everything is said in parables so that, 'they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven!' (Isaiah 6:9-10)" 
1 Corinthians 5:12-13  What business is it of mine to judge those outside the church? Are you not to judge those inside? God will judge those outside. "Expel the wicked person from among you.." (Deuteronomy 13:5; 17:7; 19:19; 21:21; 22:21, 24; 24:7)
1 Thessalonians 4:11b-12  You should mind your own business and work with your hands, just as we told you, so that your daily life may win the respect of outsiders and so that you will not be dependent on anybody. 
1 Timothy 3:7  He must also have a good reputation with outsiders, so that he will not fall into disgrace and into the devil's trap.

make the most of every opportunity
Ephesians 5:16-17  ... making the most of every opportunity, because the days are evil. Therefore do not be foolish, but understand what the Lord's will is.

Let your conversation be always full of grace 
Ephesians 4:29  Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen.

seasoned with salt 
Mark 9:50  "Salt is good, but if it loses its saltiness, how can you make it salty again? Have salt among yourselves, and be at peace with each other."

so that you may know how to answer everyone 
1 Peter 3:15  But in your hearts revere Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, ...

(parentheses are mine)

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