Repentance and suffering are two different things. Repentance is about the heart and turning our focus to God. Suffering is the body or soul; the law of sacrifice (Giving our comfort and even our lives over to God). It is by grace that we suffer and refine our spirits in progression, lifting others as we lift ourselves. This is part of having a broken heart and contrite spirit. Jesus was the perfect of example of this.
11 And I, John, bear record that I beheld his glory, as the glory of the Only Begotten of the Father, full of grace and truth, even the Spirit of truth, which came and dwelt in the flesh, and dwelt among us.
12 And I, John, saw that he received not of the fulness at the first, but received grace for grace;
13 And he received not of the fulness at first, but continued from grace to grace, until he received a fulness; (D&C 93)
Grace is another word for glory.
As we ascend from one estate to another more glory is added upon us until the fullness is given. We grow “grace for grace.” This glory, or light, or knowledge, or gift, or endowment, is how we receive our exaltation. Praise God for His everlasting mercy!