[zBard]

For finite judges of imperfect knowledge it must lead to the use of two different scales of 'morality'. To ourselves we must present the absolute ideal without compromise, for we do not know our own limits of natural strength (+grace), and if we do not aim at the highest we shall certainly fall short of the utmost that we could achieve. To others, in any case of which we know enough to make a judgement, we must apply a scale tempered by 'mercy': that is, since we can with good will do this without the bias inevitable in judgements of ourselves, we must estimate the limits of another's strength and weigh this against the force of particular circumstances.

- The Letters of JRR Tolkien