In today's reading we are confronted with our Lord's sovereign grace. We do not understand God's commands, the way he has brought his commands into this world through people and circumstances, or the way that good and evil happens in this world. We don't understand the way God saves people by grace through faith (Ecclesiastes 8.12-13). Deep down we prefer the idea of salvation by works. But that isn't what our Lord has given us.
In the final analysis we are left with nothing to do but to trust our Lord to use the means he chooses to use as he accomplishes his will. Does he give us the foolishness of preaching? Then that is what we have. Does he say to repent and be baptized in order to be saved? This is God's command. Does he tell his disciples to baptize and teach all nations? That's our duty. Does he say he is with us always even though we can't see him? Then he is with us always. It is vanity for us to decide we know better. It is vanity for us to say we fully understand. No, we don't understand, but we do believe. Let God be true and every man a liar!