Significados de constant element en inglés

In these three pictures, what is the constant element?

Prayer is a constant element, and the impulse to pray is ever present to human nature.

And-let it be said again-allthrough, the only constant element in the whole dismal process was his trained historical sense.

The globules of the blood contain fibrine and albumen, along with a red colouring matter, in which iron is a constant element.

Through all the vicissitudes of his life the needs of the moment had been all that counted with him, the one constant element.

But the dining out, being, as I have stated, a constant element, does not in the least affect a comparative statement like this.

+ D. + D. = (x), the constant elements work all on one side.

It is of especial value for our conclusions that that division in which the constant elements are least balanced (V.) is far the most numerous.