Bhagavad Gita: Chapter 7, Verse 2

ज्ञानं तेऽहं सविज्ञानमिदं वक्ष्याम्यशेषत: |
यज्ज्ञात्वा नेह भूयोऽन्यज्ज्ञातव्यमवशिष्यते || 2||

jñānaṁ te ’haṁ sa-vijñānam idaṁ vakṣhyāmyaśheṣhataḥ
yaj jñātvā neha bhūyo ’nyaj jñātavyam-avaśhiṣhyate

jñānamknowledge; teunto you; ahamI; sawith; vijñānamwisdom; idamthis; vakṣhyāmishall reveal; aśheṣhataḥin full; yatwhich; jñātvāhaving known; nanot; ihain this world; bhūyaḥfurther; anyatanything else; jñātavyamto be known; avaśhiṣhyateremains

Translation

BG 7.2: I shall now reveal unto you fully this knowledge and wisdom, knowing which nothing else remains to be known in this world.

Commentary

Jñāna is the knowledge learned by applying the mind, senses, and intellect. Whereas vijñāna (wisdom) is the knowledge gained through spiritual practice, it is a direct experiential realization and should not be misunderstood for intellectual knowledge. An example to explain this is of honey kept in a sealed jar. We have heard that honey has the sweetest taste incomparable to any sweet, but unless we open the jar and taste it, we will not get the experiential realization of its sweetness.

Likewise, the Guru gives us jñāna, which is the theoretical knowledge of the scriptures. Yet, we need to practice sādhanā as per the acquired jñāna, which would consequently purify our mind. Only then, vijñāna (wisdom) knowledge through self-realization will be attained.

Once Sage Ved Vyas intended to write the Shreemad Bhagavatam, a scripture that would describe God, His glories, nature, and as the object of devotion. But he did not wish to write it only based upon his jñāna. Therefore, he engaged himself foremost in bhakti to attain the experiential realization, which is vijñāna.
He wrote:

bhakti-yogena manasi samyak praṇihite ’male
apaśhyat puruṣhaṁ pūrvaṁ māyāṁ cha tad-apāśhrayām
(Bhagavatam 1.7.4)

“Through bhakti-yog, Ved Vyas fixed his mind upon God without any material sentiments, and thus attained the complete vision and realization of the Supreme Divine Personality along with His external energy, Maya, which was under His control.”  Inspired with this realization, he wrote the epic scripture.

In this verse, Lord Shree Krishna gives an affirmation to Arjun that He will bestow upon him the theoretical knowledge regarding the Supreme Divine Personality. He will also illuminate his mind with the required wisdom. Once this knowledge is acquired, there will be nothing remaining for him to know.