Fear in the face of the persecutor must be rejected. This will be a time for you to bear testimony. Endurance is the key for those who would be victorious over their enemies. But not a hair of your head will perish. By your endurance you will save your lives.
Endurance is built up against temptation to sin and apathy through a life of regular prayer.
Prayer is both private, such as the Rosary and meditation upon Scripture, and public, to include the Sunday liturgy and recitation of the Liturgy of the Hours. The graces given once in Baptism, strengthened by the gifts of the Holy Spirit in Confirmation, arm the Christian for the daily battle of faith. When our endurance weakens and we fall in battle by sinning, we must be healed and strengthened by sorrow and absolution. The forgiveness of mortal sins is gained through regular Confession. Through the frequent reception of the Lord's Body and Blood in the Holy Eucharist our Savior forgives our venial sins.