I've translated the 1970 letter of Ratzinger and eight other theologians to the German bishops, which was republished in Pipeline 2/2010, under the title "A reminder to the signatories" (Den Unterfertigten zur Erinnerung), and which has been in a number of newspapers in the past few days.
Some of the parts of the letter that the newspapers for some reason or other aren't citing… :
I. … We are convinced that the freely chosen state of remaining unmarried in the sense of Matthew 19 not only presents a meaningful possibility of christian existence, one which is at all times indispensable for the Church as a sign of its eschatological character, but that there are also good theological grounds for the connection of the freely chosen unmarried state and the priestly office, since this office brings the officeholder definitively and completely into the service of Christ and his Church. In this sense we affirm what was recently said in the "Letter of the German Bishops on the Priestly Office" (See n. 45, par 4; n. 53, par 2). And in this sense we are also convinced that whatever the outcome of the discussion, the unmarried priesthood will remain an essential form of the priesthood in the Latin Church.
Such a positive stocktaking and working through of the problem must also occur because the reality of celibacy itself in the conditions of present-day publicity and society must be presented in an understandable and meaningful manner—so far as possible—granting all knowledge of very clear limits of this endeavor. It will remain a "scandal", but this does not excuse one from promoting and recommending it with the best reasons, in the event that an examination is seriously undertaken and can arrive at positive results (see above, section 1). If we know that celibacy is primarily a fruit of spiritual experience, we must still, as representatives of the science of theology, draw attention to this positive, clarifying, and unavoidable function of an examination.