Locks are good when the key is with you[This thread wins a special prize for the topic-based TOW of November 2017]
Locks and keys provide us security. Imagine a life without lock and key or rather a door without a lock. We are safe, our money, documents, ornaments and everything is safe because we have proper locks and keys for each cupboard, door or gate. It provides us security as the keys are with us. When we do not have the keys, security is lost.
Some of us might have lost a key, and we know how panic the situation is. We can't enter the house or open the cupboard. Some people lock up the car with the key inside. How terrible is it. The value of the key is better realized when we misplace it. If we fail to find the key, the lock itself becomes useless and we will have to replace it.
There are some people who are put in chains due to their poor mental health. The lock and key of the chain is an obstacle to freedom. For them, the lock is a curse as the key is not with them.
Locks are good only when the key is with you.