Mor gyfnewidiol yw

  Mor gyfnewidiol yw
    Meddyliau calon dyn!
  Nid erys neb ond Duw
    A'i eiriau pur yr un;
Pob iot o'i sanctaidd eiriau ef
Yn gadarn fydd pan ballo'r nef.

  Dros dragwyddoldeb pell
    Fe bery'r Ion dilyth,
  A saif ei gynghor gwell
    A'i addewidion byth;
JEHOFA wrth ei enw gwiw,
Ac "YDWYF YR HWN Y DWYF" yw.

  How changeable are
    The thoughts of man's heart!
  No-one remains but God
    With his pure words the same;
Every jot of his holy words
Will be firm when heaven fades.

  For a distant eternity
    He will endure the unfailing Lord,
  And stand will his better counsel
    And his promises forever;
JEHOVAH by his worthy name,
And "I AM WHO I AM" it is.