EAST BOYLSTON, Mass., _10th mo. 2d, 1837_. DEAR FRIEND: In my last, I made a sort of running commentary upon thy views of the appropriate sphere of woman, with something like a promise, that in my next, I would give thee my own. The investigation of the rights of the slave has led me to a better understanding of my own. I have found the Anti-Slavery cause to be the high school of morals in our land--the school in which _human rights_ are more fully investigated, and better understood and taught, than in any other. Here a great fundamental principle is uplifted and illuminated, and from this central light, rays innumerable stream all around. Human beings have _rights_, because they are _moral_ beings: the rights of _all_ men grow out of their moral nature; and as all men have the same moral nature, they have essentially the same rights. These rights may be wrested from the slave, but they cannot be alienated: his title to himself is as perfect _now_, as is that of Lyman Beecher: it is stamped on his moral being, and is, like it, imperishable. Now if rights are founded in the nature of our moral being, then the _mere circumstance of sex_ does not give to man higher rights and responsibilities, than to woman. To suppose that it does, would be to deny the self-evident truth, that the ‘physical constitution is the mere instrument of the moral nature.’ To suppose that it does, would be to break up utterly the relations, of the two natures, and to reverse their functions, exalting the animal nature into a monarch, and humbling the moral into a slave; making the former a proprietor, and the latter its property. When human beings are regarded as _moral_ beings, _sex_, instead of being enthroned upon the summit, administering upon rights and responsibilities, sinks into insignificance and nothingness. My doctrine then is, that whatever it is morally right for man to do, it is morally right for woman to do. Our duties originate, not from difference of sex, but from the diversity of our relations in life, the various gifts and talents committed to our care, and the different eras in which we live.