…with His stripes we are healed. – Isaiah 53:5

By this Divine remedy our life is healed of its rebellion. This medicine has worked within the heart, and it has also worked outside in the life. Now has the drunk become sober and he hates the cup he used to love. Now has the swearer’s foul mouth been washed and his lips, once so polluted, are like lilies dropping sweet, smelling myrrh. Now has the cruel and unkind one becomes tender, gentle and loving—the false has become true, the proud bends his neck in humility, the idle has become a diligent servant of Christ! The transformation is wonderful and this is the secret, “With His stripes we are healed.”

Yet again, our consciousness assures us that we are healed. We know that we are healed, and we rejoice in the fact— and we are not to be argued out of it. There seems to be a theory, held by some people, to the effect that we cannot tell whether we are saved or not. When we have had a disease in our body, we can tell whether we have been healed or not, and the marks and evidence of the supernatural change that takes place within the spirit are as apparent, as a usual rule, and certainly as positive and sure as the changes worked in the body by healing medicine! We know that we are healed. I am not talking to you of a thing which I do not know personally for myself. When the text says, “We,” my heart says, “I,” and I am longing that everybody here should be able to put his own seal to it and say, “That is true! With His stripes we are healed! With His stripes we are healed! With His stripes we are healed!” ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2499.cfm