Consider.  On the evening before his death, Jesus spoke with his disciples.  Jesus told his disciples that he was about to leave them (John 13:33).  Naturally, their hearts filled with sorrow (John 16:5-6).

Jesus had already told his listeners who he is.  "I and the Father are one" (John 10:30).  "Truly, truly, I say to you, before Abraham was born, I am" (John 8:58, Exodus 3:6, Exodus 3:14).

As the remedy for their troubled hearts, Jesus asked his disciples to believe in him.  The Greek word for "believe" is pisteuó, which means have faith in, trust in (Ref. 1).
 
As the remedy for our troubled hearts, Jesus asks us to believe in him.  Jesus asks us to trust him and to have faith in him.

     The remedy for a troubled heart is to believe in Jesus.

To the father of the boy who was deaf, mute, and had seizures, Jesus said, "All things are possible for the one who believes and trusts [in Me]!" (verse 23 in Mark 9:14-29)

To the woman who touched Jesus' cloak and was healed, Jesus said, "Daughter, your faith [your personal trust and confidence in Me] has restored you to health; go in peace and be [permanently] healed from your suffering" (Mark 5:34).

To his disciples, Jesus said, "Peace I leave with you; My [perfect] peace I give to you; not as the world gives do I give to you. Do not let your heart be troubled, nor let it be afraid. [Let My perfect peace calm you in every circumstance and give you courage and strength for every challenge.]" (John 14:27). 

      Apply.  Is something troubling your heart today?  Will you choose to believe in Jesus?

     Listen.  I encourage you to listen to Louis Armstrong's recording of the African-American spiritual song, "Nobody Knows the Trouble I've Seen."

Reference
1.  https://biblehub.com/greek/4100.htm