The disciples felt secure with Jesus as their Lord and Master because time and again, He had proven to be bigger than their situations –
When demons were encountered, He cast them out; when hungry, He multiplied loaves; when sickness threatened, He healed.
In John 14, Jesus was talking about leaving, they became anxious and worried.
“When I leave,” He said, “I will send someone who will listen to you, teach you, guide you, and look out for your well-being. – I will send you a Helper, an Advocate, a Counsellor – the Spirit of Truth, who will stay with you forever.”
You see, you are never alone. The blessed Holy Spirit is in you and with you!