Every word of Christ comes to us with the challenge, "Put me to the test. Try me. Prove me." Religion is not a matter of theory, but a matter of life. We are to prove it by living it. Take every word which Christ speaks, and begin at once to obey it if it be a command, or trust it and lean on it if it be a promise. No matter if you do not understand it nor see why the command is good, yet do it. Let God lead you, and only be sure that you obey and trust him. You will not know any faster than you will do. Only keep on following Christ, and the way will open to you and become plain as you go on step by step.
Malachi 3:10-12: Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the LORD of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it. And I will rebuke the devourer for your sakes, and he shall not destroy the fruits of your ground; neither shall your vine cast her fruit before the time in the field, saith the LORD of hosts. And all nations shall call you blessed: for ye shall be a delightsome land, saith the LORD of hosts. (KJV)
Romans 4:18-21: Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be. And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah's womb: He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; And being fully persuaded that, what he had promised, he was able also to perform. (KJV)