on that Day, to every one of them will his own state be of sufficient concern.

Each one of them, that Day, will have enough concern (of his own) to make him indifferent to the others.

Every man that day will have concern enough to make him heedless (of others).

Every man of them, that day, will have concern enough to make him indifferent to others.

For every man, that Day, will be a matter adequate for him.