In your letter which lies before me I come upon "self-control" again. That is a fine acquisition for one who may profit by it, but surely to be distinguished from compulsion. It is praiseworthy and amiable to wean one's self from tasteless or provoking outbursts of feeling, or to give to them a more ingratiating form; but I call it self-constraint--which makes one sick at heart--when one stifles his own feelings in himself. In social intercourse one may practise it, but not we two between ourselves. If there be tares in the field of our heart, we will mutually exert ourselves so to dispose of them that their seed cannot spring up; but, if it does, we will openly pull it up, but not cover it artificially with straw and hide it--that harms the wheat and does not injure the tares. Your thought was, I take it, to pull them up unaided, without paining me by the sight of them; but let us be in this also one heart and one flesh, even if your little thistles sometimes prick my fingers. Do not turn your back on them nor conceal them from me. You will not always take pleasure in my big thorns, either--so big that I cannot hide them; and we must pull at them both together, even though our hands bleed. Moreover, thorns sometimes bear very lovely flowers, and if yours bear roses we may perhaps let them alone sometimes. "The best is foe to the good"--in general, a very true saying; so do not have too many misgivings about all your tares, which I have not yet discovered, and leave at least a sample of them for me. With this exhortation, so full of unction, I will go to sleep, although it has just struck ten, for last night there was little of it; the unaccustomed physical exercise has used me up a bit, and tomorrow I am to be in the saddle again before daylight. Very, very tired am I, like a child. Schönhausen, March 14, 1847.