The response to many altar calls isnt one of solemnity. Instead, there is often joyfilled applause. Whats wrong with that? There is a problem. If the gospel has been preached biblically, i.e. sinners been told that they have offended God by transgressing His Law, and they are responding in contrition, then its a solemn assembly. Clapping then would be like a child who had lied to and stolen from his father, coming to him to apologize, and the mother bursting into applause. The timing would be inappropriate. Sure, there is joy in Heaven when one sinner comes to repentance, and only Heaven knows those who are genuinely repentant. So its wise to wait for fruit before we applaud, and in the meantime, keep seeking the lost. There goes another minute. Gone forever. Go share your faith while you still have time.