What is an overview of conditional Biblical promises for truth seekers that can be empirically tested in their lifetime?

Does the Bible contain any conditional promises for truth seekers that can be empirically tested, in their lifetime, to confirm the veracity of the Christian faith? By conditional promise I mean any kind of predictive statement of the form *if you do X, you will experience Y*, where Y is promised to take place in this lifetime (i.e. the person doesn't have to wait until death to see the outcome), as long as the seeker satisfies X (the conditions). What is an overview of such conditional promises in the Bible? **Note**: this question is a variant of (and inspired by) the question https://christianity.stackexchange.com/q/85814/50422