Create in me a clean heart, O God, and put a new and right spirit within me. – Psalm 51:10

It is needful to have a nature like that of Christ. You cannot give out sweet waters so long as the fountains are impure. “Ye must be born again.” There is no walking with Jesus in newness of life unless we have a new heart and a right spirit. See to it, dear friends, that your nature is renewed-that the Holy Ghost has wrought in you a resurrection from among the dead; for, if not, your walk and conversation will savour of death and corruption. A new creature is essential to likeness to Christ: it is not possible that the carnal mind should wear the image of Jesus.

That being done, the next thing that is necessary is a constant anointing of the Holy Spirit. Can any Christian here do without the Holy Spirit? Then I am afraid that he is no Christian. But, as for us, we feel every day that we must cry for a fresh visitation of the Spirit, a renewed sense of indwelling, a fresh anointing from the Holy One of Israel, or else we cannot walk as Christ walked.

And then, again, there must be in us a strong resolve that we will walk as Christ walked; for our Lord Himself did not lead in that holy life without stern resolution. He set His face like a flint that He would do right; and He did right. Do not, I pray you, be led astray by thoughtlessly following your fellow-men: it is a poor, sheepish business, that running in crowds. Dare to be singular dare to stand alone. Stand to it firmly that you will follow Christ… And that is the thing to do, brethren, to be hearing Christ and following Him; not I to learn of you, nor you of me, but both of us of Christ: so shall we end all controversy in a blessed agreement at His feet. God help us to get there. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1732.cfm