Hebrews Chapter 2 says that our Savior, by His death, destroyed him who holds the power of death. But for a season Satan can still strike and wound us. He can still hurt us and poison our relationships and spread his deadly venom into our homes and lives.
Paul admonished the Corinthians to take great care in this area, “Lest Satan should get an advantage of us: for we are not ignorant of his devices” (II Cor. 2:11). Although this may have been true in the apostle’s day, we are not sure it is the case today. It seems to us that many believers are unaware they are under attack. Satan can be very subtle and his devices are well planned. While his devices take on many forms there is one in particular that he uses quite effectively— worry! If the enemy can keep you off balance in this area he can successfully hinder your service for the Lord.
“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” (Phil. 4:6,7).
There are some who struggle with this problem. Paul says, “Be careful for nothing.” In our modern day language we would say, “Don’t worry about anything.” The Greek word behind the term “careful” here is merimnao, which means to pull in different directions, to distract. This is exactly what worry will do to you—it will tear you apart both emotionally and physically. Worry always dwells on the future in regard to what may or may not happen. It mulls over every worst-case scenario imaginable until you are tied in knots.
But the solution? We might say it this way: the past belongs to the ages, the present belongs to us, but the future belongs to God. source