How heavy is a glass of water? That depends on how long you have to carry it for. A minute is no problem… after an hour your arm might ache, but after 24 hours you’ll probably be in fairly bad shape! In each case the glass weighs exactly the same but the longer you carry it the heavier it feels. It is the same with carrying a grudge or un-forgiveness.
Source: quoted in The UCB Word For Today , 20/6/2008