"For which of you, intending to build a tower, does not sit down first and count the cost, whether he has enough to finish it?" Luke 14.28
Intelligent faith has nothing to do with excitement, enthusiasm or feelings. Rather, Biblical faith requires the use of the intellect. It weighs, measures and checks that it is 100% in agreement with what he believes. From then, one must throw himself body, soul and spirit. That is, put all strength towards his goal.
"He who has an ear, let him hear what the Spirit says to the churches. He who overcomes shall not be hurt by the second death." Revelation 2.11
The phrase: 'He who has an ear...' doesn't seem to make sense, since everyone has ears. However, the Lord is speaking to those who are born of the Spirit. Only those who are born of the Spirit have ears that are able to listen to His voice. And in the case of those who are convinced but aren't born of God, they will not have an excuse when Judgement Day comes because they had ears and did not obey. Those who overcome are not the ones who start out well, but they finish well.