Php 4:4 Rejoice in the Lord alway: and again I say, Rejoice.
Php 4:5 Let your moderation be known unto all men. The Lord is at hand.
Php 4:6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
Php 4:7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
Moderation in verse 5 refers to restraint from excess, which is just as important, if not harder, now than it was then. Not only is Paul suggesting they be moderate in their passions, but they do so publically. This faith and moderation is not a private affair or one to hide where it might be less popular.
He goes on to say be careful for nothing, which is translated in other places as be anxious for nothing, or not to worry. We are told many times not to worry or be anxious, and here Paul gives us what to do instead - pray. Instead of worrying about something, we're simply to pray and give it to God. If we pray and truly trust in God, He will keep us and our minds and hearts in His peace and take away our worry. I try to remember when I am worried that this wasn't presented as an option.