You will know whether or not to share, and how much to share, when you are conscious of your intuition, that inner “nudge” from your conscience that guides you to do what is right.
One important area for meditation regarding our desire to share (or hide) these teachings is pride. When we feel worried about the potential criticism from others, we may not speak the truth when it is our duty to do so. Our pride prevents us from doing what is right. Conversely, when we want others to admire us for this knowledge or to agree with our opinions, our pride may force the knowledge on those who do not want it or are not ready for it. Thus, the ego compels us to wrong action.
It takes tremendous psychological balance to know when to act and when to keep silent, and our heart should be centered on the selfless benefit of others. Meditate on the consequences of your actions, both the potential harm and the potential good, and work to eliminate any ego that prevents you from performing the will of your inner divinity.
We must always remember that these teachings are not our property, and that we have received them out of great mercy. It may be the case that at moments we become the vehicle of such knowledge, but we cannot claim credit for it nor be attached to the results of our action. Whether the knowledge is accepted or rejected by others, we must follow our conscience and do what is right, which may vary case by case.