As a rule we may measure a man's understanding by his useful activities; this is what the wise man very plainly tells us. Certain persons call themselves "cultured," and yet they cultivate nothing. Modern thought, as far as I have seen anything of its actual working, is a bottle of smoke, out of which comes nothing solid; yet we know men who can distinguish and divide, debate and discuss, refine and refute, and all the while the hemlock is growing in the furrow, and the plough is rusting. Friend, if your knowledge, if your culture, if your education does not lead you practically to serve God in your day and generation, you have not learned what Solomon calls wisdom, and you are not like the Blessed One, who was incarnate wisdom, of whom we read that "he went about doing good." A lazy man is not like our Saviour, who said, "My Father worketh hitherto, and I work." True wisdom is practical: boastful culture vapors and theorizes. Wisdom ploughs its field, wisdom hoes its vineyard, wisdom looks to its crops, wisdom tries to make the best of everything; and he who does not do so, whatever may be his knowledge of this, of that, or of the other, is a man void of understanding. Why is he void of understanding? Is it not because _he has opportunities which he does not use_? His day has come, his day is going, and he lets the hours glide by to no purpose. Let me not press too hardly upon any one, but let me ask you all to press as hardly as you can upon yourselves while you enquire each one of himself, Am I employing the minutes as they fly? This man had a vineyard, but he did not cultivate it; he had a field, but he did not till it. Do you, brethren, use all your opportunities? I know we each one have some power to serve God; do we use it? If we are his children he has not put one of us where we are of necessity useless. Somewhere we may shine by the light which he has given us, though that light be only a farthing candle. Are we thus shining? Do we sow beside all waters? Do we in the morning sow our seed, and in the evening still stretch out our hand? for if not, we are rebuked by the sweeping censure of Solomon, who saith that the slothful is a "man void of understanding."