It is a great mischief that comes from lacking first principles, and the worst part of it comes from lacking first principles in morals. Thereby our eyes are holden so that we see not the great social evils all about us. We attempt to justify slavery, even to do it in the name of Jesus Christ. The whig party of the North loves slavery; the democratic party does not even seek to conceal its affection therefor. A great politician declares the Mexican war wicked, and then urges men to go and fight it; he thinks a famous general not fit to be nominated for President, but then invites men to elect him. Politics are national morals, the morals of Thomas and Jeremiah, multiplied by millions. But it is not decided yet that honesty is the best policy for a politician; it is thought that the best policy is honesty, at least as near it as the times will allow. Many politicians seem undecided how to turn, and so sit on the fence between honesty and dishonesty. Mr. Facing-both-ways is a popular politician in America just now, sitting on the fence between honesty and dishonesty, and, like the blank leaf between the Old and New Testaments, belonging to neither dispensation. It is a little amusing to a trifler to hear a man's fitness for the Presidency defended on the ground that he has no definite convictions or ideas! There was once a man who said he always told a lie when it would serve his special turn. It is a pity he went to his own place long ago. He seemed born for a party politician in America. He would have had a large party, for he made a great many converts before he died, and left a numerous kindred busy in the editing of newspapers, writing addresses for the people, and passing "resolutions." It must strike a stranger as a little odd, that a republic should have a slaveholder for President five sixths of the time, and most of the important offices be monopolized by other slaveholders; a little surprising that all the pulpits and most of the presses should be in favor of slavery, at least not against it. But such is the fact. Everybody knows the character of the American government for some years past, and of the American parties in politics. "Like master, like man," used to be a true proverb in old England, and "Like people, like ruler," is a true proverb in America; true now. Did a decided people ever choose dough-faces?--a people that loved God and man, choose representatives that cared for neither truth nor justice? Now and then, for dust gets into the brightest eyes; but did they ever choose such men continually? The people are always fairly represented; our representatives do actually represent us, and in more senses than they are paid for. Congress and the Cabinet are only two thermometers hung up in the capital, to show the temperature of the national morals.