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i believe you means i believe you are telling the truth, and i believe IN you means that you believe someone can do something
Credere (To believe):
Credo - I believe.
Credes - You believe.
Credet - He/she/it believes.
Credemus - We believe.
Credetis - You (plural) believe.
Credent - They believe.
Believe me, they believe
Creer means to believe Creo- I believe Crees- You (inf.) believe Cree- You (f.) believe, he/she believes Creemos- we believe creen- they believe
I Believe in You - You Believe in Me - was created in 1973-06.