believe in
US /bɪˈliːv ɪn/
UK /bɪˈliːv ɪn/

1.
credere in
to have faith in the existence of something or someone
:
•
Do you believe in ghosts?
Credi nei fantasmi?
•
I believe in God.
Credo in Dio.
2.
credere in, avere fiducia in
to have confidence in the ability or goodness of someone or something
:
•
I believe in you, you can do it!
Credo in te, puoi farcela!
•
She still believes in the power of kindness.
Crede ancora nel potere della gentilezza.