It reinforced my belief that...

Meaning

The experience strengthened a pre-existing belief.

Examples

• John: Did the conference change your perspective?
• Alice: It did. <b>It reinforced my belief that</b> collaboration is key.
• John: That's great, What kind of collaboration are you referring to?
• Alice: Indeed. The team work made a difference and <b>it reinforced my belief that</b> collaboration is key.