"And I, if I be lifted up from the earth, will draw all men unto me."
Rom 5:2 By whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God.
Heb 9:14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
The scripture makes it clear that few will find the way to eternal life: "Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it" (Matt 7:13-14). "For many are called [through the gospel], but few are chosen" (Matt 22:14).
So is John 12:32 a proof text for universal salvation? No. Rather it shows God’s grace through the Light (Christ), His offering to all indiscriminately, so that only those who believe in him may not perish but have eternal life.