And Joseph her husband, being a righteous man and not wanting to disgrace her, planned to send her away secretly. But when he had considered this, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not be afraid to take Mary as your wife; for the Child who has been conceived in her is of the Holy Spirit.”

Matthew 1:19-20 (NASB)

When we quiet ourselves before God we are most receptive to His calming Spirit, who is able to deliver us from our doubts and fears.