God says all His commandments are righteousness. (Ps 119:172) Of course, all God’s commandments are righteous (138), yet together they also compose the complete definition of moral perfection. Removing or neglecting any one of God’s commands yields an inferior standard; each of His laws reveals a facet of holiness, departure from which defines sin. (1Jn 3:4)
This explains why we ought not neglect any part of Torah (Ps 119:6), because doing so diminishes its full scope and impact in our lives. (Mt 5:19) God is love (1Jn 4:16), and every word from Him faithfully testifies of and reveals His love. (Ps 119:86)
Every single law in Torah hangs on, is derived from, the Laws of Love for God and Man (Mt 22:40); these commands help us understand love and guide us to walk in love. So, for as long as Love is not perfected in us all (1Jn 4:17), not even one small nuance of the law shall fail, or be discarded, or made obsolete. (18)