As Christians, we trust that God will supply everything we need. In fact, we know that everything we have came from God and is intended to be a blessing to us, for which we thank God.
Christians are done with sin because Christ suffered and died for sin. With whatever time remains on earth, Christians seek to make the most of it by living for God's glory.
The Apostle Paul's mission work in Corinth serves as a case study for the principle: God's Word works. Some reject the Word, but some are brought to faith.