“And we are His witnesses to these things, and so also is the Holy Spirit whom God has given to those who obey Him.” – Acts 5:32

True faith is reliance. Look at any Greek lexicon you like, and you will find that the word pisteuein does not merely mean to believe, but to trust, to confide in, to commit to, entrust with, and so forth; and the marrow of the meaning of faith is confidence in, reliance upon. Let me ask, then, every professor here who professes to have faith, is your faith the faith of reliance? You give credit to certain statements, do you also place trust in the one glorious person who alone can redeem? Have you confidence as well as credence? A creed will not save you, but reliance upon the Anointed Saviour is the way of salvation.

Moreover, true faith is not a flattering presumption, by which a man says, “I believe I am saved, for I have such delightful feelings, I have had a marvelous dream, I have felt very wonderful sensations;” for all such confidence may be nothing but mere assumption. Presumption, instead of being faith, is the reverse of faith; instead of being the substance of things hoped for, it is a mere mirage. Faith, is as correct as reason, and if her arguments are considered, she is as secure in her conclusions as though she drew them by mathematical rules. Beware, I pray you, of a faith which has no basis but your own fancy.

When the Holy Ghost leads us to rely upon the Lord Jesus, then the truth that God gave His only begotten Son that whosoever believeth in Him might be saved, is opened up to our souls, and we see that for us who are believers, Jesus died with the special intent that we should be saved. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0979.cfm