It is the sorry state of the Roman Catholic church which tells its members that confidence in Christ's word and God's providence is presumption. Thankfully, Paul did not suffer under the lies of Trent.
"For the which cause I also suffer these things: nevertheless I am not ashamed: for I know whom I have believed, and am persuaded that he is able to keep that which I have committed unto him against that day." -- 2 Timothy 1:12
Read your Bible and learn of God's everlasting promise.
But ye believe not, because ye are not of my sheep, as I said unto you. My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand. I and my Father are one." -- John 10:25-30 "Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, they bear witness of me.
It's really too bad you believe such Scriptural assurance is "sanctimony." Whoever is telling you that is not telling you the truth.