The complete sentence is that I can do everything through Christ who gives me strength. It means that I can do anything through Christ, and Christ has given me strength!
The famous basketball player Curry also took this sentence as his motto. Currie believes in Christianity, and his MVP speech regards faith as one of the biggest factors of his success. I once wrote on a basketball and many sneakers: I can do anything.
"I can do everything" has always been Curry's belief. Curry was questioned all the way. No matter how many honors he gets, there will always be people questioning him. Curry worked so hard just to tell those who looked down on him before, "I can do anything."