Predestination and Free will

Sarah was predestined to have a son in her old age, but she had to sleep with her husband for it to happen.

If you were starving and God sent me to feed you, the food wouldn't do anything for you until you ate it.

It's not predestined for anyone to be lost.

2Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.

But yet, many will be lost because they choose not to accept the part that's up to them.

Rev. 3:5 He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.