Common salvation – temporal, non-eternal, mutable: enjoyed by both non-believers and believers.

Special salvation — eternal, immutable: for God’s children only.

God’s children = sincere believers in Jesus

“For those he foreknew he also predestined to be conformed to the image of his Son, so that he would be the firstborn among many brothers and sisters. And those he predestined, he also called; and those he called, he also justified; and those he justified, he also glorified.” – Paul, apostle of Emperor Jesus (Romans 8:29–30, CSB)