James 4:2
Ye lust, and have not: ye kill, and desire to have,
and cannot obtain: ye fight and war, yet ye have not, because ye ask not.

Not everything and or everybody is for us.
Wanting is a part of our human nature lusting is wanting of things that we don't have weather it's human or anything else. Lusting after things can cause us to forget to forgive giving place to revenge for that's that not our own.
Seeing others with that they want but don't...