The reply of the Princess Palatine to Robert Barclay's request, is interesting as a specimen of the religious correspondence of these illustrious friends. She says, "Your memory is dear to me, so are your lines and exhortations very necessary. I confess also myself spiritually very poor and naked; all my happiness is, I do know I am so, and whatever I have studied or learnt heretofore is but dirt in comparison with the true knowledge of Christ. I confess my infidelity to this Life heretofore, by suffering myself to be conducted by false, politic lights. Now that I have sometimes a small glimpse of the true Light, I do not attend it as I should, being drawn away by the works of my calling, which must be done; and as your swift English hounds I often overrun my scent, being called back when it is too late." In his reply, Barclay tells of the non-success of his efforts to obtain the release of his friends, and yet adds with calm heroism, "I this day take my journey towards them, not doubting but I shall also share their joys." Nor was he mistaken. Soon after reaching Aberdeen, he was arrested and placed in the Tolbooth. This gaol was divided into two parts, the lower, which was vile, the upper, which was worse. Robert Barclay was allowed a place in the lower prison, but those who were arrested with him were thrust into the upper prison. Here shortly afterwards they were joined by David Barclay, who had been released only to fall again into the clutches of the enemy. The news of Robert Barclay's commitment to prison reached his royal friend Elizabeth the next month (Dec. 1676). She at once wrote to console him. "I am sure that the captivers are more captive than you are, being in the company of him that admits no bonds, and is able to break all bonds." She also wrote at once to her brother Prince Rupert to use his influence with the king on his behalf.