Hebrews 1:12:

And as a vesture shalt thou fold them up, and they shall be changed: but thou are the same, and thy years shall not fail.

See also:

Jesus the Healer Has Never Changed

Objection: God Does Great Miracles Only During Crucial Times in History

Objection: We Should Live for Eternity, Not for Temporal Blessings

Objection: Mental Illness Is Treatable but Not Curable

Objection: Like Any Loving Parent, God Sometimes Has to Tell His Children NO for Their Own Good

Objection: Sometimes God Says, “Yes,” Sometimes He Says, “No,” and Sometimes He Says, “Wait” When You Ask for Healing

Notes on Malachi 3:6

Notes on Hebrews 13:8