In all religions, using holy beads for chanting is common. There are different names for it in every religion. But the common thread that binds these beads is an idea.
The core idea behind chanting a mantra or a deity’s name or any prayer is to imbibe the divinity behind the same. To take on the virtues of the name we are taking, or to become as peaceful and pure as the prayer we are reciting or to emerge our own inner powers through the mantra we are chanting.
The core idea is to recite something as many times as it takes to become the very essence of it. To imbibe the great purity, power and divinity behind it.