Theophylact of Ohrid
Catena Aurea · Johannesevangelium 12
And there were certain Greeks among them that came up to worship at the feast. The same came therefore to Philip, which was of Bethsaida of Galilee, and desired him, saying, Sir, we would see Jesus. Philip cometh and telleth Andrew: and again Andrew and Philip tell Jesus. And Jesus answered them, saying, The hour is come, that the Son of man should be glorified. Verily, verily, I say unto you, Except a corn of wheat fall into the ground and die, it abideth alone: but if it die, it bringeth forth much fruit. He that loveth his life shall lose it, and he that hateth his life in this world shall keep it unto life eternal. If any man serve me, let him follow me; and where I am, there shall also my servant be: if any man serve me, him will my Father honour. Philip cometh and telleth Andrew.
It were harsh to say that a man should hate his soul; so He adds, in this world: i. e. for a particular time, not for ever. And we shall gain in the end by so doing: shall keep it unto life eternal.