Philippians 4:6-7 "Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus."
As a child growing up, I imagine I must have heard the phrase, "be careful" a million times, and as a mother myself, I imagine I have said that phrase two million times! In this scripture, Paul is saying to be careful for nothing. He is speaking of worry, not wise caution. We could change this wording to say, "Don't worry over anything, but pray about everything with peace knowing God's power is sufficient, being thankful as you are asking for Him to answer your requests."
It does not profit us to pray and then worry that God didn't hear or that He won't answer. Worry is fear, fear is not faith. If we are wavering in our assurance of God's power, love or ability, then we need to ask Him for His help in our unbelief. God always meets us right where we are at, even if that place is far away. Sometimes we have to ask Him to help us to believe that we CAN believe.
As a child can be brutally honest, we should be honest with our Father. I always encouraged my children to tell me the truth, teaching them that they would receive a much worse correction for telling a lie about what they had done wrong. Our Father God is an even better parent than any of us could ever be. He is more interested in helping us grow and become all we can be in Christ, fully showing forth the characteristics of our God than in making us walk a chalk line. The more honest we are, or actually, the more we confess our sins, then we have a promise that he is faithful and just to forgive those sins! I John 1:9