Seattle lecture-Oct 18 1968
The test of any scripture is how one is developing love of God. Phalena paricīyate. If you find that following some religious principles you are developing your love of God, then it is perfect. It doesn't matter whether it is Bible or Koran or Bhagavad-gītā. It doesn't matter. We have to see what is the fruit. If the fruit is that people are developing love of Godhead, then it is perfect.
Don't try to understand whether this is good, this is good, this is bad, this is... No. Try to understand by the result. Just like the same way: if you see the fruit, then it is first class. So it doesn't matter whether it is Bible or Gītā. If you can develop love of Godhead by reading Bible, it is first class, and if you can develop love of Godhead by Bhagavad-gītā, it is first class. And if you do not, then either it is Bible or the Koran or Bhagavad-gītā, it has no effect for you. So it is up to you.
Not by comparison, but by your own activities. If you actually follow the instruction given by Lord Jesus Christ, you will also develop love of Godhead. There is no doubt. Similarly, if you follow the instruction of Kṛṣṇa, you will also develop. So it is up to you. You try to follow. If you do not follow, simply try to make a comparative study "This is good" or "This is bad," "This is bad" or "This is good," that is called śrama eva hi kevalam [SB 1.2.8]—simply laboring. Why comparative study? Just see how much you are developing love of Godhead, that's all. Phalena paricīyate. "Whether it is apple is there, that's all right; never mind what is this tree. I'm concerned with the apple." Yes.