Revelation 3:7–8 (NLT)
7 “Write this letter to the angel of the church in Philadelphia. This is the message from the one who is holy and true, the one who has the key of David. What he opens, no one can close; and what he closes, no one can open: 8 “I know all the things you do, and I have opened a door for you that no one can close. You have little strength, yet you obeyed my word and did not deny me.

Proverbs 2:3–4
3 Cry out for insight, and ask for understanding. 4 Search for them as you would for silver; seek them like hidden treasures.

1 Corinthians 16:5–9
5 I am coming to visit you after I have been to Macedonia,[a] for I am planning to travel through Macedonia. 6 Perhaps I will stay awhile with you, possibly all winter, and then you can send me on my way to my next destination. 7 This time I don’t want to make just a short visit and then go right on. I want to come and stay awhile, if the Lord will let me. 8 In the meantime, I will be staying here at Ephesus until the Festival of Pentecost. 9 There is a wide-open door for a great work here, although many oppose me.