If we could first know where we are, and whither we are tending, we could better judge what to do, and how to do it. We are now far into the fifth year since a policy was initiated with the avowed object, and confident promise, of putting an end to slavery agitation. Under the operation of that policy, that agitation not only has not ceased, but has constantly augmented. In my opinion, it will not cease until a crisis shall have been reached and passed. "A house divided against itself cannot stand." I believe this Government cannot endure permanently half slave and half free. I do not expect the Union to be dissolved; I do not expect the house to fall; but I do expect that it will cease to be divided. It will become all one thing, or all the other. Either the opponents of slavery will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward till it shall become alike lawful in all the States, old as well as new, North as well as South. Have we no tendency to the latter condition? Let any one who doubts carefully contemplate that now almost complete legal combination piece of machinery, so to speak--compounded of the Nebraska doctrine and the Dred Scott decision. Let him consider not only what work the machinery is adapted to do, and how well adapted, but also let him study the history of its construction, and trace, if he can, or rather fail, if he can, to trace the evidences of design and concert of action among its chief architects from the beginning.