Jesus uses a proverb to teach his disciples. This should be translated with as few words as possible. Alternate translation: "Those who find their lives will lose them. But those who lose their lives ... will find them" or "If you find your life you will lose it. But if you lose your life ... you will find it" (See: [[rc://en/ta/man/translate/writing-proverbs]])
This does not mean the person will die. It is a metaphor that means the person will not experience spiritual life with God. Alternate translation: "will not have true life" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This does not mean to die. It is a metaphor that means a person considers obeying Jesus more important than his own life. Alternate translation: "who denies himself" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This metaphor means the person will experience spiritual life with God. Alternate translation: "will find true life" (See: [[rc://en/ta/man/translate/figs-metaphor]])