PROVERBS 27:1
"Do not brag about tomorrow, since you do not know what the day will bring."
Because you wake up each morning you believe that you will always wake up tomorrow morning, but do you know that one day you will be wrong? We are all appointed once to die, and then the judgement. Death comes at the will of God and not at your will. You do not control your destiny and you do not know the moment that you will be called by God. Understanding this premise it is foolish for anyone to say what they will do tomorrow for they do not know what the day may bring forth!
The right approach to any future plan is to say, "God willing", I will do this or that. You must acknowledge that God is in control of you and the universe that you live in. We tend to make plans, some simple, some grandiose. Any plan we make is dependent on the will of God. He alone gives us even our breath. So good advice is not to brag about any future plan we have for we are not in control of what happens.
You can make a plan for your future, just acknowledge that God is in control of your future. The more complete the plan or vision, the more likely it is to come to fruition. Before building a home or starting a war, we should get many counselors and have a finite plan. We must learn from our mistakes or we are condemned to repeat them, but this is not to say that we can go about telling everyone how we are going to do this or that without acknowledging that it must be with "God willing". Of course everyone has failures and their plans fail with regularity, but even though we are to be good stewards of what God has given us, remember that it is God who gives us everything including life and that eternal if we acknowledge Him in all of our ways.