(I couldn't find a good pic for this one.)
Stand to reason
To seem very likely from the known facts.
If you have a drivers license, it stands to reason you can drive.
(I If you have a driver's license,
you are almost sure to know how to drive)
Joe is intelligent and studies hard;
it stands to reason that he will pass the examination.
(Being smart and a good students,
Joe is almost sure to pass the examination.)