I have told you these things, so that in Me you may have [perfect] peace and confidence. In the world you have tribulation and trials and distress and frustration; but be of good cheer [take courage; be confident, certain, undaunted]! For I have overcome the world. [I have deprived it of power to harm you and have conquered it for you.]
John 16:33 (AMP)
Though our world is filled with trials and tribulations we should not be afraid, for our calling as Christ followers is to be confident because He has already conquered the enemy.