Let him who would move and convince others be first moved and convinced himself. Let a man but speak forth with genuine earnestness the thought, the emotion, the actual condition of his own heart, and other men, so strangely are we all knit together by the tie of sympathy, must and will give heed to him. Carlyle.
Let him who would write heroic poems make his life a heroic poem. Milton.
Let ilka ane soop (sweep) before his ain door. Sc. Pr.
Let it be your first care not to be in any man's debt. Johnson.
Let it not be grievous to thee to humble and 20 submit thyself to the capricious humours of men with whom thou conversest in this world, but rather ... endure patiently whatever they shall, but should not, do to thee. Thomas à Kempis.
Let it not be imagined that the life of a good Christian must necessarily be a life of melancholy and gloominess; for he only resigns some pleasures, to enjoy others infinitely greater. Pascal.
Let John Bull beware of John Barleycorn. Pr.
Let justice guide your feet. Hipparchus.
Let knowledge grow from more to more, / But more of reverence in us dwell. Tennyson.
Let man be noble, helpful, and good, for that 25 alone distinguishes him from every other creature we know. Goethe.