Mantra And Prayer

Chanting Mantra is different from prayer indeed.
Mantra is Sounds, not by mental understanding.

In so, when you use Mantra not-understandable
to you, this mantra is suitable.
Becuase you use mental power
when you understand meanings of Mantra.

Chanting is co-fusion of Sounds
and Frequencies with no direction
and objectives,
and not mental work at all.

Prayer has its objects and meanings,
which is totally different from Mantra.