Heb 3:13-14

13 but exhort one another daily, while it is called "Today," lest any of you be hardened through the deceitfulness of sin. 14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end,

2 Cor 4:16

Therefore we do not lose heart. Even though our outward man is perishing, yet the inward man is being renewed day by day.