“Now if you unintentionally fail to keep any of these commands the Lord gave Moses”
Sin is sin. Even David prayed to be cleansed from his secret faults, those sins which he himself was not aware of. Sins committed in ignorance shall be forgiven through Christ the great Sacrifice, who, when he offered up himself once for all upon the cross, prayed “Father, forgive them, for they know not what they do.”
Sins may be unintentional and possibly committed in ignorance, but they still need to be dealt with.
Lock Your Wings 
At first I thought it was pretty strict that a man collecting wood on the Sabbath would be ordered by God to be stoned. But I found this online which would indicate that it was not a hidden sin but an arrogant disregard for God’s instructions. This incident is evidently narrated as an instance of presumptuous sin. The mere gathering of sticks was not a sinful act and might be necessary for fuel to warm him or to make ready his food. But its being done on the Sabbath altered the entire character of the action. The law of the Sabbath being a plain and positive commandment, this transgression of it was a known and wilful sin, and it was marked by several aggravations. For the deed was done with unblushing boldness in broad daylight, in open defiance of the divine authority–in flagrant inconsistency with His religious connection with Israel, as the covenant-people of God; and it was an application to improper purposes of time, which God had consecrated to Himself and the solemn duties of religion. The offender was brought before the rulers, who, on hearing the painful report, were at a loss to determine what ought to be done. That they should have felt any embarrassment in such a case may seem surprising, in the face of the sabbath law ( Exodus 31:14 ). Their difficulty probably arose from this being the first public offense of the kind which had occurred; and the appeal might be made to remove all ground of complaint–to produce a more striking effect, so that the fate of this criminal might be a beacon to warn all Israelites in the future
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I too thought that being stoned was a little harsh, but this gives a good perspective on the outright disregard for God’s commands. Good find.
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