Be wise in the way you act toward [unbelievers]; make the most of every opportunity. Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone. (Colossians 4:5–6, NIV 1984).
Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect. (1 Peter 3:15, NIV 1984).
My Musings – Opportunity. A set of circumstances that makes it possible to do something. But it only makes it possible. It does not make it so. We must act on (“make the most of“) the opportunity. But when it comes, “the way [we] act toward [unbelievers],” no matter how well intended (“full of grace’), how well thought out (“always be prepared“), and how well executed (“seasoned with salt, gentleness and respect“) cannot make it so either. The unbeliever must act on it as well.
My Advice – The unbeliever may not seize the opportunity this time. We may never have another opportunity with them. But if we make the most of our opportunity to share, perhaps we have “primed the pump” for their next time opportunity comes knocking. And maybe, just maybe, something we said or did (“the reason for the hope that you have“) will have made it possible for them to hear the knocking. Pray that they make the most of it and answer the “door.”