Pray without doubt 

But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed: James 1:6

When you ask your Heavenly Father a thing you should ask Him as a son ask His father of His needs. A son will ask His father without doubting because He is aware of what His father can offer Him.  You are born to the family of Christ as a child of God not by blood but by the spirit of God. John1:13. Therefore don’t ask God for something like a stranger or beggar ask without confident or being sure that His/Her request will be granted.

A beggar repeats His/Her request every day. You should not ask God in way of such but let your request to be straight forward without repeating the same thing in your prayers.  Matthew 6:7 But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking. When you ask in prayer you should ask God with faith that He had received your request.

As a born again Christian you are one of God’s heirs to the inheritance prepared for His saints. Then you should ask God without doubting Him.

Conclusion:

Dear reader, when asking God for anything let your request be built in faith that you’re asking your father for needs and that He had heard you.