How do we know that suffering is part of God's plan?

In 1 Peter 4:12-13, it is stated, 'Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you. But rejoice, inasmuch as ye are partakers of Christ’s sufferings; that, when His glory shall be revealed, ye may be glad also with exceeding joy.' This passage highlights that suffering is not foreign to the Christian experience; instead, it is a necessary facet of the faith walk. God uses suffering both to test and to strengthen believers. The assurance that their suffering is under God's control supports their rejoicing, knowing it contributes to their sanctification and brings about glory in the end. Therefore, understanding suffering as part of God's plan is derived from His Word, which encourages believers to embrace trials as part of their faithful discipleship.