"Be very careful, then, how you live -- not as unwise but as wise, making the most of every opportunity, because the days are evil. Therefore do not be foolish, but understand what the Lord's will is."
It's really easy to waste time. You do it. I do it. We've got so much time that we have time to kill. But do we?
You've heard it said that we should "live like there is no tomorrow" and not waste any opportunity, but in reality you will always have tomorrow and eternity. Anyone who is in Christ has died already to sin, how can they die again? And if we have died to sin, how can we continue to live in it?
Perhaps the saying should be "live like you'll live forever". Every opportunity that God gives you to do a good deed he has given you so that you might be blessed in doing them as Paul wrote in Ephesians 2:10
"For we are God's workmanship, created in Christ Jesus to do good works which God prepared in advance for us to do."
If you refuse the gifts, then you don't get them, simple as that. We live a fallen world and we make the best of every situation because it is the Lord's will for the redemption of this world. Every opportunity passed over is a grace forfeited so be careful how you live, not as foolish but with wisdom. Do the best you can with what you have.