More from Webster's 1828 Dictionary:

VEN'TURE, v.i.

1. To dare; to have courage or presumption to do, undertake or say. A man ventures to mount a ladder; he ventures into battle; he ventures to assert things which he does not know.

2. To run a hazard or risk.

On my own, joy seems such a venture.  But joy, rested in Christ, is not uncertain in it's success.  The joy of the Lord is our Strength.  And He never changes.

Rest well, in that knowledge!