VIII. It is one thing to maintain that God has not decreed to save anyone except through legitimate means; another that the decree to save these or those persons through legitimate means is conditional and of uncertain event (which the adversaries feign). ...
IX. It is one thing for the thing decreed to be conditional; another for the decree itself. The former we grant, but not the latter. There can be granted an antecedent cause or condition of the thing willed, but not immediately of the volition itself. Thus God wills salvation to have the annexed condition of faith and repentance in the execution, but faith and repentance are not the condition or cause of the act of willing in God, nor of the decree to save in the intention.
[Francis Turretin, Institutes of Elenctic Theology. 1.4.3. 9-10]
Is the Gospel conditional or is it not? Is salvation conditional? The answers given by many people nowadays are incoherent, because they have lost the clarity of thought that characterized Reformed Scholasticism. Those like the PRCA (Protestant Reformed Churches of America) in their attack against the "conditional covenant" showed forth their theological incoherence as they simultaneously attacked the idea that there are conditions in the Covenant of Grace, yet will defend that faith in Jesus Christ is necessary for salvation (which would make "faith in Jesus Christ" a condition). Others like the Federal Vision will state openly that faith is necessary and thus a condition in the Covenant of Grace, then like Norman Shepherd assert that conditionality implies humans are to fulfill those conditions, thus undermining the "faith not works" principle of the Gospel and the Covenant of Grace. In both of these examples, failure to think clearly and logically result in theological error and incoherence, with further implications for the lives of believers as they are worked out (either in Legalism or Antinomianism).
In contrast to such confusion in the modern broadly Reformed sphere, Turretin's clarify shines forth. There is no such thing as a "conditional decree" or a "conditional covenant," but there are conditions within God's decree and covenant. Faith is a condition, but faith is conditioned as absolutely decreed, not as a decree that is conditioned upon Man having faith. This is the clarity we need to reject the errors in our time in the Reformed sphere of churches, and keep to the narrow path of orthodoxy.