John 10:27, 28 – “I give them eternal life, and they shall never perish; no one can snatch them out of my hand.” (NIV 1978)
My Musings – The only reason to doubt eternal security is if the “salvation” experience was not genuine. But if it was genuine, it cannot be lost or taken away.
My Advice – You cannot lose your salvation by anything that you say or do, because “no one” includes you. But this does not mean you should live your life as you wish without concerns. God will discipline to bring correction (sometimes He even takes people home early), there may be lasting negative consequences (for this life) and you can lose blessings and rewards (this life and the next).