Whenever I am asked if I believe in something, I ask

is it?

or

Isn't it?

There is no in between

in other words:

if you think something, nobody can tell you it's not what you're thinking and whether or not you are thinking it wouldn't be opinion based

i also can upgrade from

i think blood types and personality traits are connected

to

i know....

but how do i know?

if i am 100 percent about something then is think really the correct term?

do i need to weaken it?

...