Not only thought control but speech control is essential too!

Let’s say that an individual observes a proper thought control but his/her speech remains out of control. This would backfire on the thought control making it become weaker and ineffective. A habit of being talkative compels an individual to keep searching for new topics or issues to talk about (which, in turn, will compel his/her mind to keep on thinking about new topics). Therefore, observing a proper control of speech is also essential alongside the thought control. To store something securely, we may put it in a container. If the container has a hole, we will patch it up first before putting the thing in. But then we will also make sure that we close the lid firmly. Or else, the thing we have stored can get spilled over anytime.
Thought control would stop mental capabilities being wasted in needless thoughts, desires and feelings. However, its practical aspect and expression is channelized through speech. If speech is not kept under proper control, the thought control would eventually become ineffective and useless. Therefore, speech control must go hand in hand with thought control.
The first and foremost step in mastering speech control is to learn to speak less. Whatever that needs to be said should be expressed in bare minimum and carefully chosen words.