In a shop which sells suits, we can look at the mannequins in the window and buy off the peg suits or be personally measured for a suit that perfectly fits us. By entering into God's Kingdom and accrediting Him with Kingship we will indeed receive what we personally need, which is variable from day to day. We will have times of want and times of overflowing but either way, we are receiving what God knows we need. There are many verses along these lines and here is one of them - "Delight yourself in the LORD, and he will give you the desires of your heart". (Psalm 37:4)