Matthew 6:21 (NKJV)
Everyone has a treasure of some kind. While they probably do not have an actual treasure chest or a locked box with money, jewels, or some other valuable thing inside there is something that they treasure. The first and most obvious treasure someone could have would be money, jewels, or something else of significant financial worth. There are many things that people value and treasure, many different things that people put their time and effort into because they consider those things to have great value. The question is if what we value really is valuable.
Jesus said in Matthew 6 that our heart will be in the place where our treasure is. You could turn this around to say it another way, you will value and invest in what your heart is connected to. What we put our time, effort, and financial resources into shows what we believe in and care about, it shows where our heart is. If we really believe in something we will commit to it. Jesus recommended that we make eternal investments, that we put our time, effort, and financial resources into things that have eternal value.
Are the things we use our time for, put our effort into, and spend our money on things that are of eternal value or just a source of temporary pleasure? Of course God wants us to enjoy our life, to have our financial needs met, and to be able to have leisure time to spend with family and friends. But will what we do today mean anything in the perspective of eternity? Are we investing our time, energy, and financial resources in promoting God's Kingdom and helping others? The answer to that shows where our treasure is and that reveals where our heart is as well.