An example of this...

Here are five alternatives to "An example of this can be seen..." to add variety to your essay writing:

• "This is illustrated by..."

• "One instance of this is..."

• "A case in point is..."

• "This is evident in..."

• "A clear demonstration of this is..."

This quote shows that...

Here are some alternatives for "This quote shows that..."

• This evidence demonstrates that...

• This statement highlights the idea that...

• From this, we can infer that...

• This passage reinforces the argument that...

• This excerpt illustrates how...

One reason for this is...

Eliminate the phrase "One reason for this is..." from your writing.  Here are some alternatives:

• A key factor supporting this claim is...

• One compelling argument in favor of this is...

• Evidence for this can be seen in...

• A significant justification for this perspective is...

• This point is further reinforced by...