instinctive force

I tested, by my own efforts, her instinctive force of affection, by taking her by the arms and endeavouring to remove her; but she sent up such a pitiful cry, mixed with her imitative cluck and cackle, that I let her go, as much through a sudden impulse of fear as from an inability to lift her by the power of my arms.

She felt the rebellion like the onslaught of angels of light against powers of darkness; it was the ideal doing battle with some primal, instinctive force.

The many lessons of self-control and self-restraint which she had learnt returned with instinctive force.

And it is an almost instinctive force which urges the author on in his creative work.

They stick together, and grow up on their farms, which are of enormous extent, and which they get to love with the instinctive force of people who have never seen any other place.