But can we say that it is as much in a man’s power to realise Virtue as it is to fulfil Duty?[173] To some extent, no doubt, we should say this: no quality of conduct is ever called a virtue unless it is thought to be _to some extent_ immediately attainable at will by all ordinary persons, when circumstances give opportunity for its manifestation. In fact the line between virtues and other excellences of behaviour is commonly drawn by this characteristic of voluntariness;--an excellence which we think no effort of will could at once enable us to exhibit in any appreciable degree is called a gift, grace, or talent, but not properly a virtue. Writers like Hume,[174] who obliterate this line, diverge manifestly from common sense. Still I regard it as manifestly paradoxical to maintain that it is in the power of any one at any time to realise virtue in the highest form or degree; (_e.g._) no one would affirm that any ordinary man can at will exhibit the highest degree of courage in the sense in which courage is a virtue--when occasion arises. It would seem, therefore, that we can distinguish a margin of virtuous conduct, which may be beyond the strict duty of any individual as being beyond his power. Can we then, excluding this margin, say that virtuous conduct, so far as it is in a man’s power, coincides completely with his duty? Certainly we should agree that a truly moral man cannot say to himself, “This is the best thing on the whole for me to do, but yet it is not my duty to do it though it is in my power”: this would certainly seem to common sense an immoral paradox.[175] And yet there seem to be acts and abstinences which we praise as virtuous, without imposing them as duties upon all who are able to do them; as for a rich man to live very plainly and devote his income to works of public beneficence.