While we cannot know God exhaustively, we can know him truly. The finite human mind cannot fully comprehend the nature of an infinite God (even in heaven), but we can grow in our understanding and experience of God as he has revealed himself in Creation, Scripture, and through Jesus Christ.
“The secret things belong to the LORD our God, but the things revealed belong to us and to our sons forever, that we may observe all the words of this law.”—Deut. 29:29
“Oh, the depth of the riches of the wisdom and knowledge of God! How unsearchable his judgments, and his paths beyond tracing out!”—Rom. 11:33
“Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.” – Hebrews 1:1-2
“This is what the LORD says: “Let not the wise man boast of his wisdom or the strong man boast of his strength or the rich man boast of his riches, but let him who boasts boast about this: that he understands and knows me, that I am the LORD, who exercises kindness, justice and righteousness on earth, for in these I delight,” declares the LORD.”—Jer. 9:23-24