"I have a word for you, but you are not ready yet."
If a prophetic word is received, then it is incumbent upon the one receiving to reveal it. It is not for the recipient to debate within himself if the person is 'ready to receive it'. There are problems if the word is not brought forth.
A. A person may not receive guidance where they need it and possibly cannot receive healing until they receive a confirmation on their end.
B. The person who received it cannot be promoted. They demonstrate that they cannot be trusted because the word God gave them to give to someone they did not show wisdom in delivering to the person.
C. Neither the one the message is intended for or the one intended to deliver it can grow. The one who the message is intended for, if he receives it, may learn something about the person, is he reliable, honest, trustworthy. A respect between the two, learning more about each other, cannot be had.
D. If the two lose contact with one another, then the person cannot then receive the revelation.
As to who 'received' it.
1. If you are not confident enough to come forward with it, it is doubtful you have received a revelation at all or that you are simply demon possessed.
2. The statement is a unbelievably prideful. "I have a word (see, I am a spiritual person), but you are not ready (you are not a spiritual person).
3. It also is intended to make a statement about oneself. "I receive revelation from God".
Overall, there seems to be a lot of holes in making a claim of this sort and absolutely no upside. If you receive something from God about someone, it's not really a good idea to hold it from the person because while you might expect the opportunity to discuss it later, often times there is never such an opportunity.
Another thing that must be asked is is the word truly for the person or could the word also be significant for you? Does the word confirm to you something about yourself, or does it cause you to ask questions about yourself and explore how God is using you or intends to use you. These words may not always be as meaningful for the person they apply to as it is to you.
Also, if you receive a word about someone but you are not convinced it is the time to discuss it, then it may not be the time and the best thing you can do is not mention it at all. When the time comes to discuss it, if it ever does, you will know.