When I invite someone to meet up or go somewhere together and she / he has other plan, the connotation is that I am disappointed that my plan will not work out. Likewise with my life plan.

However when he has other plan, God's plan is better. Always!

I am still disappointed that I am not getting my plan. Because, obviously, I like what I concocted. Over time, though, I start to understand better his plan and appreciate that his plan is, without a doubt, better than my plan.

God knows what he is doing.

See: Floodgates