But as for the soul, which indeed, can only be truly sensible of either fear or grief; to which only it belongs according to its different imaginations and opinions, to admit of either of these, or of their contraries; thou mayst look to that thyself, that it suffer nothing. Induce her not to any such opinion or persuasion. The understanding is of itself sufficient unto itself, and needs not (if itself doth not bring itself to need) any other thing besides itself, and by consequent as it needs nothing, so neither can it be troubled or hindered by anything, if itself doth not trouble and hinder itself.