["I'm trying to convince my friend to hop on board this business venture.  I'm staying positive I'm sure he'll come around", 'That sounds like it could be a great success.  Do you both work well together?', "Don't know yet but I trust him.  And we both make a lot of cash on this self-employed gig we're on"]
I hope its a major triumph for you both!
I'm staying positive about this business scheme.  I'm sure my friend will come around, he just needs some good convincing