It represents something ingrained in the blood.

The religious world had been, up to that time, chained to the anthropomorphic conception of Deity, and it was even less due to the purely scientific faculty than to the philosophic that Darwin came as a liberator from a depressing superstition,the belief in the terrible Hebrew God, ingrained in the conscience of every reverently educated boy, and become in his growth inseparable from the maturer beliefs.

So the fear of hell was ingrained into an ignorant people for four centuries.

All decaying wood in the building should be removed, and any portion ingrained with dirt should be planed clean.

They were absolutely ingrained with the accumulated dirt of ages; but he affirmed them to be clean.

The adherence to neutrality led to the crash of 1806, and would have meant the final overthrow of Prussia as a State had not the moral qualities still existed there which Frederick the Great had ingrained on her by his wars.

The reason why this process is not always successful at the first attempt is that all our life we have been holding the false belief in sickness as a substantial entity in itself and thus being a primary cause, instead of being merely a negative condition resulting from the obsence of a primary cause; and a belief which has become ingrained from childhood cannot be eradicated at a moment's notice.