"And so we know and rely on the love God has for us. God is love.
Whoever lives in love lives in God, and God in him." 1 John 4:16

The 'we know' in our verse is spiritual knowledge for verse 13 tells us, "We know that we live in Him and He in us, because He has given us of His Spirit." Scripture has much to say of knowledge, let's look at some general references that, hopefully, will open up spiritual knowledge to us.

We see that spiritual knowledge is--
Obtained by acquaintanceship with God:
"Let us know, let us press on to know the Lord.
His going forth is as certain as the dawn; And He will come to us like the rain, Like the spring rain watering the earth." Hosea 6:3 And in the New Testament, "But the natural man does not accept the things of the Spirit of God, for they are foolishness to him and he can not understand them, because they are spiritually appraised. But he who is spiritual appraises all things..."
1 Corinthians 2:14-15

Spiritual knowledge is a cause for exultation:
"But let him who glories glory in this,
That he understands and knows Me..." Jeremiah 9:24

Spiritual knowledge is received though obedience:
Upon the Jews questioning Jesus as to where His knowledge comes from since He has never been 'educated', John 7:16-17 says, "Jesus therefore answered them, and said, 'My teaching is not Mine, but His who sent Me. If any man is willing to do His will, he shall know of the teaching, whether it is of God, or whether I speak from Myself."

Spiritual knowledge liberates the soul from all error:
"Jesus therefore was saying to those Jews who had believed Him, 'If you abide in My word, then your are truly disciples of Mine; and you shall know the truth, and the truth shall make you free.'" John 8:31-32

Spiritual knowledge leads to eternal life:
"And this is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent." John 17:3

And what should be the Believer's attitude toward knowledge?
An attitude to grow in spiritual knowledge:
"But grow in grace and knowledge of our Lord and Savior Jesus Christ."
2 Peter 3:18

An attitude to add to our spiritual knowledge:
2 Peter 1:2-11 speaks of the Christian's growth in Christ. Vs. 5 tells us:
"Now for this very reason also, applying all diligence, in your faith supply moral excellence, and in your moral excellence, knowledge."

An attitude to stand firm and not be carried away by error of lawless men, "Therefore, dear friends, since you already know this (that false teachers are coming), be on your guard so that you may not be carried away by the error of lawless men and fall from your secure position." 2 Peter 3:17 (Note from the NIV Study Bible)

An attitude to be filled with spiritual knowledge:
"And this I pray, that your love may abound still more and more in knowledge and all discernment." Philippians 1:9

Scripture also tells us that we only know in part now, but we wait with joy knowing that we will know fully at Christ's return.
"For we know in part...but when the perfect comes, the partial will be done away." 1 Corinthians 13:9-10 And, "For now we see in a mirror dimly, but then face to face; now I know in part, but then I shall know fully just as I also have been fully known."
Vs. 12

What is the source of spiritual knowledge?
God:
"Blessed is the man whom You instruct, O Lord, And teach out of Your law." Psalm 94:12

Nature:
"The heavens declare the glory of God;
And the firmament shows His handiwork.
Day unto day utters speech,
And night unto night reveals knowledge." Psalm 19:1-2

Scripture:
"All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; that the man of God may be adequate, equipped for every good work." 2 Timothy 3:16-17

Doing God's will as mentioned above in John 7:17.

And so 'we know'! Thank you Lord for Your loving-kindness that desires to impart knowledge and wisdom to us. We bless you and give You all praise and honor, for it belongs to You. Amen