"For he has been mindful of the humble state of his servant." Luke 1:48a (NIV)
"When God is mindful of you, he notices everything in your life."
No one cares more about your life than God. No man, no woman, not even you. That's why God's destiny is always the best. God loves you perfectly and he is always thinking about you and thinking about what is best for you.
"Give God all your worries and all your cares for he is always thinking about you watching everything that concerns you" (1 Peter 5:7). Whatever concerns you, concerns God. Whatever you're worried about, whatever you're afraid of, whatever keeps you up at night, whatever gets your attention, gets God's attention. No one will care more about your life, so why not give him your life to care about?
Mary could say yes to God's plan for her life because she knew God was looking out for her and was always thinking about her. That's why she could sing praises to him and say, "for he has been mindful of the humble state of his servant" (Luke 1:48a NIV).
What does it mean that God is mindful of you? It means he's alert, he's focused, he's paying attention. When God is mindful of you, he notices everything in your life. Matthew 10:19-30 says not even a sparrow can fall to the ground without God noticing. He even numbers every hair on your head. That's how close God pays attention to you.
That's why it's worth going God's way rather than your way. Accepting God's destiny for your life is the best plan.