His labours as a professor were prompted by unsparing energy; they were rewarded by one of the truest evidences of merit, the devoted sympathy and attachment of his pupils. To stimulate their minds to philosophic thought, to lead them to insight rather than tenacity of conviction, and empower them to think for themselves,—this, as the steady principle of his endeavours, is repeatedly set forth in his lectures, and undeviatingly ruled his practice. In all matters of College business his sound judgment and vigorous good sense were acknowledged and looked up to by his colleagues. His students felt sure there was not one among their professors to whose generous consideration of their feelings they might more confidently trust, or whose resolute assertion of all that was due to his own office they must more implicitly respect. They revered him as a guide to truth and wisdom, they loved him as an elder friend and fellow-labourer.
His devotion to contemplative study was so persistent and absorbing, that he was seldom induced to leave his home in St Andrews for excursions to any distant quarters. His friends both in Scotland and England had often to regret the rareness of the visits which he paid them, not only on their own account, but, as they believed, for his sake also. For they could not repress within them the strong persuasion that the intensity of his solitary labours in search of truth was wearing him out, and that whenever he could be induced to intermit the restless mental exercise, usually carried on far into the morning hours,
