Who throws the dice for you?

[Ben Davis]

I think you're over-interpreting things.

Entirely possible

- If a pie is tasty to me, then I like that pie.
- Only if a pie is tasty to me, then I like that pie.

There may be other reasons that I like that pie (perhaps its color).

Possible in the first statement, impossible in the second: If the only reason for liking the pie is the taste, there can be no other reason; the condition is wholly sufficient and necessary with no other condition required or available for resolution of the statement. Consequently, it is equivalent to cause: 'I like the pie because it is tasty to me'.