"And you also must testify, for you have been with me from the beginning." John 15: 27 - NIV
I like the ESV version of this verse better. It says we must bear witness. That term "bear witness" is so powerful because it doesn't talk about winning arguments, making points or convincing people. Instead it talks about highlighting truth, showing the way, encouraging others in their journey.
I believe that a generous mind is one who bears witness to what God has put on their heart. They don't try and convince or demand people to take their ideas. Instead they put them on display for people to see, touch, feel and interact with.
Are you bearing witness to the truth that God has given you to share?