Where, How, Why, When, What

God told Abraham to go, but did not tell him where.
God told David he will be king, but did not tell him how.
Joseph upheld God's righteousness and suffered for it but God did not tell him why.
All Christians are told that Jesus will be coming again but God did not tell us when.

But God told us what is required of us.

And now, Israel, what doth the LORD thy God require of thee, but to fear the LORD thy God, to walk in all his ways, and to love him, and to serve the LORD thy God with all thy heart and with all thy soul, To keep the commandments of the LORD, and his statutes, which I command thee this day for thy good? (Deuteronomy 10:12-13 KJV)

He hath showed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God? (Micah 6:8 KJV)

Then they said to him, "What must we do, to be doing the works of God?" Jesus answered them, "This is the work of God, that you believe in him whom he has sent." (John 6:28-29 ESV)

One day, we shall know God face to face.

And no longer shall each one teach his neighbor and each his brother, saying, 'Know the LORD,' for they shall all know me, from the least of them to the greatest, declares the LORD. For I will forgive their iniquity, and I will remember their sin no more. (Jeremiah 31:34 ESV)