Why dc series motor should start with load?

In DC Series Motors the field is in series with Armature. When the motor starts at

no load, the armature current is very low and so is the field current. As the speed

of DC Motor is inversely proportional to field current, the motor will try to shoot up

to very high speed at no load and it can be dangerous for the motor itself and for

this reason, any DC Motor should always be started on load.