Jesus' Discourse on Assurance 

In a powerful sermon, Jesus responded to a query about the legitimacy of his teachings and the reality of the kingdom he proclaimed. He emphasized that the truth of his message should be judged by its spiritual fruits, assuring that those who recognize God as their Father are indeed his children. This familial analogy aimed to alleviate doubts about spiritual acceptance, reinforcing believers' confidence in their heavenly citizenship through faith and adherence to God's will. Jesus also underscored the enduring peace and assurance prophesied by Isaiah for those accepting his gospel, which guarantees eternal life and mandates a life marked by love for one another. Jesus' discourse comforted and inspired both the crowd and his apostles.

One of the great sermons Jesus preached in the temple during Passover week was in response to a question posed by one of his listeners, a man from Damascus. This individual addressed Jesus: "But, Rabbi, how shall we know of a certainty that you are sent by God, and that we may truly enter into this kingdom which you and your disciples declare is near at hand?" And Jesus replied:

“As to my message and the teaching of my disciples, you should judge them by their fruits. If we proclaim the truths of the spirit, the spirit will witness in your hearts that our message is genuine. Concerning the kingdom and your assurance of acceptance by the heavenly Father, let me ask what father among you, who is a worthy and kindhearted father, would keep his son in anxiety or suspense regarding his status in the family or his place of security in the affections of his father’s heart? Do you earth fathers take pleasure in torturing your children with uncertainty about their place of abiding love in your human hearts? Neither does your Father in heaven leave his faith children of the spirit in doubtful uncertainty as to their position in the kingdom. If you receive God as your Father, then indeed and in truth are you the sons of God. And if you are sons, then you are secure in the position and standing of all that concerns eternal and divine sonship. If you believe my words, you thereby believe in him who sent me, and by thus believing in the Father, you have made your status in heavenly citizenship sure. If you do the will of the Father in heaven, you shall never fail in the attainment of the eternal life of progress in the divine kingdom.

"The Supreme Spirit shall bear witness with your spirits that you are truly the children of God. And if you are the sons of God, then have you been born of the spirit of God; and whosoever has been born of the spirit has in himself the power to overcome all doubt, and this is the victory that overcomes all uncertainty, even your faith."

“Said the Prophet Isaiah, speaking of these times: ‘When the spirit is poured upon us from on high, then shall the work of righteousness become peace, quietness, and assurance forever.’ And for all who truly believe this gospel, I will become surety for their reception into the eternal mercies and the everlasting life of my Father’s kingdom. You, then, who hear this message and believe this gospel of the kingdom are the sons of God, and you have life everlasting; and the evidence to all the world that you have been born of the spirit is that you sincerely love one another.”

Following his message, the crowd remained with Jesus for several hours, asking him questions and listening intently to his comforting answers. Even the apostles were inspired by Jesus' teaching to preach the gospel of the kingdom with greater power and assurance. This experience in Jerusalem was a great inspiration for the twelve. It was their first experience with such large crowds, and they learned many valuable lessons that would be useful later in their careers.