Philippians 4:6

Majority Text:
μηδεν μεριμνατε, αλλ᾿ εν παντι τη προσευχη και τη δεήσει μετα ευχαριστίας τα αιτήματα υμων γνωριζέσθω προς τον Θεόν.

KJV:
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.

Comments:
Be careful for nothing: Paul's admonition to worry about nothing matches Jesus' lesson from the Sermon on the Mount in Matthew 6:25-33. There, the same Greek word for "be careful" is translated in the KJV as "take thought."

prayer: While not necessarily public, the word used for prayer here does provoke the idea of spoken prayer. It is, for example, the word Jesus uses in Matthew 21:13 to say that the Temple should be a house of "prayer."

supplication: This word points to pleas motivated by a particular need. It is often used in conjunction with "prayer" as it is in this verse. It is not necessarily exclusive in meaning from prayer. It is simply a prayer more directed toward a particular need.

with thanksgiving: This addition to the command to pray, plead, and let requests be known matches 1 Thessalonians 5:18.

Expanded Paraphrase:
Worry about not one single thing. Instead, in every circumstance let your petitions be known before God through your spoken prayer and your personal petitions. And don't forget to give thanks--after all, you are able to bring your needs before God and He cares about you.