Planning for tomorrow is time well spent; worrying about tomorrow is time wasted. Sometimes it’s difficult to tell the difference. Careful planning is thinking ahead about goals, steps, and schedules, and trusting in God’s guidance. When done well, planning can help alleviate worry. Worriers, by contrast, are consumed by fear and find it difficult to trust God. They let their plans interfere with their relationship with God. Don’t let worries about tomorrow affect your relationship with God today.(Tyndale Study Bible)
As a young Christian this is most probably the most difficult thing to grasp and rely on. All our life, prior to salvation, we have relied on our own understanding. It was always me, myself and I. I remember attending motivational programs and courses to improve myself. Why? Because we worry about tomorrow.
Just like the commentator says, good planning is good, yet we have to ask God for His guidance. Then we have to trust and ask for improvements as the days go by. If we asked God for guidance we can rely on Him to execute our day perfectly and diligently. I must just stress here that relying on God’s understanding does not mean that we should do nothing. The most important principle in the Bible applies here. Seed time and harvest. You reap what you sow. You will get out what you put in. You apply this diligently you wont need to worry about tomorrow.
Rely on God’s understanding, not on the worldly influences.