καρδίᾳ … ψυχῇ … διανοία. St Mark and St Luke add ἰσχύς. In Deut. the words are heart … soul … might. καρδία includes the emotions, will, purpose; ψυχή, the spiritual faculties; διάνοια the intellect, the thinking faculty. This greatest commandment was written on the phylactery which the ‘lawyer’ was probably wearing. See ch. Mat 23:5.
St Mark (Mar 12:32-34) adds the lawyer’s rejoinder and the commendation of Jesus, ‘thou art not far from the Kingdom of God.’