'Heartfelt' in the Bible

Indeed, in the path of Your judgments, O Lord,We have waited expectantly for You;Your name, even Your memory, is the desire and deep longing of our souls.

Though they fast, I will not hear their cry; and though they offer burnt offerings and grain offerings, I will not accept them [because they are done as obligations, and not as acts of loving obedience]. Instead I will consume them by the sword, by famine, and by pestilence.”

Be miserable and grieve and weep [over your sin]. Let your [foolish] laughter be turned to mourning and your [reckless] joy to gloom.

Therefore, confess your sins to one another [your false steps, your offenses], and pray for one another, that you may be healed and restored. The heartfelt and persistent prayer of a righteous man (believer) can accomplish much [when put into action and made effective by God—it is dynamic and can have tremendous power].